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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

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