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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships Classified as Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Pre-tax income (loss) $ 720 $ (285)