Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details)

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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenues:          
Revenues $ 2,548,545,000 $ 2,702,720,000 $ 6,968,487,000 $ 7,705,939,000  
Cost of Sales:          
Cost of Sales (2,171,978,000) (2,315,909,000) (5,933,959,000) (6,578,806,000)  
Operating income (loss) 96,433,000 65,196,000 (71,898,000) 215,484,000  
Assets:          
Receivables, net 286,938,000   286,938,000   $ 432,742,000
Liabilities:          
Other accrued liabilities 246,958,000   246,958,000   266,211,000
Deferred income taxes 0   0   8,927,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 668,540,000   668,540,000   790,158,000
Parts, service and collision repair          
Revenues:          
Revenues 320,929,000 352,047,000 914,667,000 1,048,789,000  
Cost of Sales:          
Cost of Sales (164,403,000) (183,107,000) (475,964,000) (546,067,000)  
Finance, insurance and other, net          
Revenues:          
Revenues 126,784,000 $ 126,841,000 352,848,000 $ 351,429,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 11,100,000   $ 11,100,000   $ 12,900,000