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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income (loss) from operations | $ 739 | $ (829) | $ (5,505) | $ (2,289)
Gain (loss) on disposal | 38,422 | 0 | 39,613 | (24)
Lease exit accrual adjustments and charges | 2 | 0 | (18) | 0
Pre-tax income (loss) | 39,163 | (829) | 34,090 | (2,313)
Total revenues | $ 30,751 | $ 135,231 | $ 108,777 | $ 266,349

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