Long-Term Debt - Additional Information (Detail)
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12 Months Ended |
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Mar. 27, 2017
USD ($)
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Mar. 10, 2017
USD ($)
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Nov. 30, 2016
USD ($)
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May 09, 2013
USD ($)
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Jul. 02, 2012
USD ($)
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Dec. 31, 2017
USD ($)
Location
$ / shares
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Dec. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
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| Debt Instrument [Line Items] |
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| Loss on repurchase of debt instrument |
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$ 14,607,000
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| Minimum EBTDAR to rent ratio |
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385.00%
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| Incremental interest expense |
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$ 3,100,000
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$ 5,500,000
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$ 7,800,000
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| Net expense expected to be reclassified |
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100,000
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| Derivative Instruments and Hedging Activities [Member] | Interest Rate Swap and Interest Rate Cap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative asset, fair value of interest rate swap and cap positions |
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4,700,000
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| Derivative Instruments and Hedging Activities [Member] | Interest Rate Swap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative liability, fair value of interest rate swap and cap positions |
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3,700,000
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| Derivative Instruments and Hedging Activities [Member] | Other Current Assets [Member] | Interest Rate Swap and Interest Rate Cap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative asset, fair value of interest rate swap and cap positions |
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900,000
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| Derivative Instruments and Hedging Activities [Member] | Other Assets [Member] | Interest Rate Swap and Interest Rate Cap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative asset, fair value of interest rate swap and cap positions |
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5,100,000
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| Derivative Instruments and Hedging Activities [Member] | Other Assets [Member] | Interest Rate Swap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative asset, fair value of interest rate swap and cap positions |
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2,800,000
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| Derivative Instruments and Hedging Activities [Member] | Other Accrued Liabilities [Member] | Interest Rate Swap and Interest Rate Cap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative liability, fair value of interest rate swap and cap positions |
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1,000,000
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| Derivative Instruments and Hedging Activities [Member] | Other Accrued Liabilities [Member] | Interest Rate Swap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative liability, fair value of interest rate swap and cap positions |
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4,100,000
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| Derivative Instruments and Hedging Activities [Member] | Other Long-Term Liabilities [Member] | Interest Rate Swap and Interest Rate Cap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative liability, fair value of interest rate swap and cap positions |
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$ 300,000
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| Derivative Instruments and Hedging Activities [Member] | Other Long-Term Liabilities [Member] | Interest Rate Swap [Member] |
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| Debt Instrument [Line Items] |
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| Derivative liability, fair value of interest rate swap and cap positions |
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$ 2,400,000
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| Mortgage Notes [Member] |
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| Debt Instrument [Line Items] |
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| Debt weighted average interest rate on note |
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4.22%
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| Number of operating locations related to mortgage financing | Location |
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10
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| Mortgage financing aggregate |
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$ 52,500,000
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| Percentage of operating locations related to mortgage financing |
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45.00%
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| Outstanding mortgage principal balance |
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$ 419,700,000
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| Notes payable due date |
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between 2018 and 2033
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| Required Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
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150.00%
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| 2016 Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Maturity date of revolving credit facility and floor plan facility |
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Nov. 30, 2021
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| Minimum EBTDAR to rent ratio |
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385.00%
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| 2016 Credit Facility [Member] | Required Ratio [Member] |
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| Debt Instrument [Line Items] |
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| Minimum EBTDAR to rent ratio |
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150.00%
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| 2016 Credit Facility [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Net income and retained earnings free of restrictions |
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$ 148,700,000
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| 2016 Revolving Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Increased availability under borrowing facility |
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$ 25,000,000
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| Current borrowing capacity |
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250,000,000
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| Maximum borrowing capacity |
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300,000,000
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| Borrowing base |
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247,600,000
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| Letters of credit outstanding amount |
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17,300,000
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| 2016 Revolving Credit Facility |
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75,000,000
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| Borrowing availability amount |
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155,300,000
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| 2016 Floor Plan Facilities [Member] |
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| Debt Instrument [Line Items] |
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| Increased availability under borrowing facility |
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$ 215,000,000
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| Maximum borrowing capacity |
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1,015,000,000
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| Increase in credit facility borrowing capacity |
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$ 1,265,000,000
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| 2016 Used Vehicle Floor Plan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Allocation of credit facility increase, percentage |
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30.00%
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| 7.0% Senior Subordinated Notes Due 2022 [Member] |
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| Debt Instrument [Line Items] |
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| Principal amount |
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$ 200,000,000
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| Stated interest rate on debt agreement |
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7.00%
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7.00%
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7.00%
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| Notes maturity date |
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Jul. 15, 2022
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| Cash paid to extinguish of debt instrument including early redemption premium and accrued and unpaid interest |
$ 213,700,000
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| Loss on repurchase of debt instrument |
$ 14,600,000
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| 7.0% and 6.125% Senior Subordinated Notes [Member] |
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| Debt Instrument [Line Items] |
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| Double-carry interest expense |
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$ 700,000
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| 6.125% Senior Subordinated Notes due 2027 [Member] |
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| Debt Instrument [Line Items] |
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| Principal amount |
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$ 250,000,000
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| Stated interest rate on debt agreement |
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6.125%
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6.125%
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6.125%
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| Notes maturity date |
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Mar. 15, 2027
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| Notes issued at a price of principal amount |
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100.00%
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| Notes issued yield maturity, percentage |
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6.125%
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| Interest payable description |
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semi-annually in arrears on March 15 and September 15 of each year.
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| Notes redemption price percentage of the principal amount |
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100.00%
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| Redemption Price |
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106.125%
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| Notes redemption price percentage of the par value due to change of control |
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101.00%
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| Debt instrument maximum allowed dividends per share | $ / shares |
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$ 0.12
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| Restrictive covenants under credit facilities and 6.125% notes |
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Specifically, the indenture governing the 6.125% Notes limits Sonic’s ability to pay quarterly cash dividends on its Class A and Class B common stock in excess of $0.12 per share. Sonic may only pay quarterly cash dividends on its Class A and Class B common stock if Sonic complies with the terms of the indenture governing the 6.125% Notes.
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| Outstanding principal amount of the 6.125% notes |
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25.00%
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| 6.125% Senior Subordinated Notes due 2027 [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Notes redemption price percentage of the principal amount |
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35.00%
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| 6.125% Senior Subordinated Notes due 2027 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
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$ 50,000,000
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| 5.0% Senior Subordinated Notes due 2023 [Member] |
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| Debt Instrument [Line Items] |
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| Principal amount |
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$ 300,000,000
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| Stated interest rate on debt agreement |
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5.00%
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5.00%
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5.00%
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| Notes maturity date |
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May 15, 2023
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| Notes issued at a price of principal amount |
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100.00%
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| Interest payable description |
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semi-annually in arrears on May 15 and November 15 of each year
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| Notes redemption price percentage of the principal amount |
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100.00%
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| Notes redemption price percentage of the par value due to change of control |
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101.00%
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| Debt instrument maximum allowed dividends per share | $ / shares |
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$ 0.10
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| Restrictive covenants under credit facilities and 6.125% notes |
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Specifically, the indenture governing the 5.0% Notes limits Sonic’s ability to pay quarterly cash dividends on Sonic’s Class A and Class B common stock in excess of $0.10 per share. Sonic may only pay quarterly cash dividends on Sonic’s Class A and Class B common stock if Sonic complies with the terms of the indenture governing the 5.0% Notes. Sonic was in compliance with all restrictive covenants in the indenture governing the 5.0% Notes as of December 31, 2017.
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| Outstanding principal amount of the 6.125% notes |
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25.00%
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| Outstanding notes repurchased amount |
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$ 10,700,000
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| Repurchase amount paid in cash, plus accrued and unpaid interest related thereto |
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$ 10,600,000
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| 5.0% Senior Subordinated Notes due 2023 [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Indebtedness with outstanding balance under other agreements |
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$ 50,000,000
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| 9.0% Senior Subordinated Notes due 2018 [Member] |
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| Debt Instrument [Line Items] |
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| Stated interest rate on debt agreement |
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9.00%
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| Convertible senior notes due |
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2018
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