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Derivative Financial Instruments - Liabilities Related to Zero-Cost Interest Rate Collar (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance $ 2,661,500     $ 1,456,500 $ 1,467,700
Ending balance 2,807,600 $ 2,661,500     1,456,500
Interest Rate Contract | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (8,600) (9,200) $ (9,800) (7,900) (1,000)
Gain (loss) recorded from interest rate collar 1,900 (100) (100) (2,300) (6,900)
Amounts reclassified from AOCI to floorplan interest expense 700 700 700 400  
Ending balance (6,000) (8,600) (9,200) (9,800) (7,900)
Interest Rate Contract | Accrued Liabilities | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (2,600) (2,500) (2,500) (1,900) (100)
Gain (loss) recorded from interest rate collar (600) (800) (700) (1,000) (1,800)
Amounts reclassified from AOCI to floorplan interest expense 700 700 700 400  
Ending balance (2,500) (2,600) (2,500) (2,500) (1,900)
Interest Rate Contract | Other Long-Term Liabilities | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (6,000) (6,700) (7,300) (6,000) (900)
Gain (loss) recorded from interest rate collar 2,500 700 600 (1,300) (5,100)
Amounts reclassified from AOCI to floorplan interest expense 0 0 0 0  
Ending balance $ (3,500) $ (6,000) $ (6,700) $ (7,300) $ (6,000)