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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continuing Operations (Details) - Disposed dealerships that remain in continuing operations - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income (loss) from operations before taxes and items below | $ (2,580) | $ 2,717 | $ (5,158)
Gain (loss) on disposal of dealerships (1) | 3,095 | 74,812 | 39,307
Lease exit accrual adjustments and charges | 0 | 170 | (408)
Impairment charges | 0 | 0 | (8,137)
Income (loss) before taxes | 515 | 77,699 | 25,604
Total revenues | $ 52,138 | $ 419,469 | $ 884,581

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