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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Revenues:            
Revenues $ 2,614,081,000 $ 2,505,749,000 $ 5,003,219,000 $ 4,906,523,000    
Cost of Sales:            
Cost of Sales (2,232,770,000) (2,143,374,000) (4,262,897,000) (4,191,649,000)    
Operating income (loss) 62,973,000 50,647,000 150,288,000 70,835,000    
Assets:            
Receivables, net 364,026,000   364,026,000     $ 438,186,000
Liabilities:            
Other accrued liabilities 243,869,000   243,869,000   $ 255,836,000 257,823,000
Deferred income taxes 23,416,000   23,416,000     33,178,000
Stockholders' Equity:            
Retained earnings 723,469,000   723,469,000   $ 663,263,000 670,691,000
Parts, service and collision repair            
Revenues:            
Revenues 355,312,000 346,754,000 696,742,000 698,512,000    
Cost of Sales:            
Cost of Sales (184,766,000) (179,703,000) (362,960,000) (361,833,000)    
Finance, insurance and other, net            
Revenues:            
Revenues 118,349,000 $ 104,104,000 224,587,000 $ 197,829,000    
ASU 2014-09 | Finance, insurance and other, net            
Assets:            
Contract assets $ 5,900,000   $ 5,900,000     $ 5,400,000