Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Derivative Instruments and Hedging Activities Narrative (Details)

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Long-Term Debt - Derivative Instruments and Hedging Activities Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Cash premiums paid $ 2,500 $ 2,800  
Unamortized premium 3,700 4,600  
Incremental interest expense 1,200 200 $ 3,100
Net benefit expected to be reclassified 1,300    
Designated as hedging instrument | Interest rate swap      
Derivatives, Fair Value [Line Items]      
Derivative liability, fair value of interest rate swap and cap positions 100 4,800  
Designated as hedging instrument | Other current assets | Interest rate swap      
Derivatives, Fair Value [Line Items]      
Derivative liability, fair value of interest rate swap and cap positions $ 100 1,800  
Designated as hedging instrument | Other assets | Interest rate swap      
Derivatives, Fair Value [Line Items]      
Derivative asset, fair value of interest rate swap and cap positions   $ 3,000