Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continuing Operations (Details)

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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