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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Revenues: |  |  |  |  |  |
Revenues | $ 2,702,720,000 | $ 2,470,849,000 | $ 7,705,939,000 | $ 7,377,372,000 |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (2,315,909,000) | (2,110,313,000) | (6,578,806,000) | (6,301,962,000) |  |
Operating income (loss) | 65,196,000 | 48,137,000 | 215,484,000 | 118,972,000 |  |
Assets: |  |  |  |  |  |
Receivables, net | 365,005,000 |  | 365,005,000 |  |  | $ 438,186,000
Liabilities: |  |  |  |  |  |
Other accrued liabilities | 259,467,000 |  | 259,467,000 |  | $ 255,836,000 | 257,823,000
Deferred income taxes | 20,513,000 |  | 20,513,000 |  |  | 33,178,000
Stockholders' Equity: |  |  |  |  |  |
Retained earnings | 748,166,000 |  | 748,166,000 |  | $ 663,263,000 | 670,691,000
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 352,047,000 | 343,118,000 | 1,048,789,000 | 1,041,630,000 |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (183,107,000) | (176,302,000) | (546,067,000) | (538,135,000) |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 126,841,000 | $ 98,061,000 | 351,429,000 | $ 295,890,000 |  |
ASU 2014-09 | Finance, insurance and other, net |  |  |  |  |  |
Assets: |  |  |  |  |  |
Contract assets | $ 5,900,000 |  | $ 5,900,000 |  |  | $ 5,400,000

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