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Derivative Instruments and Risk Management Activities - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
derivative_instrument
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value of swaps that became effective in the period $ 300,000,000      
Maximum notional amount of derivatives in effect at any time 902,400,000      
Accumulated unrealized gains (losses), net of income taxes 8,900,000 $ (700,000) $ (9,300,000)  
Gain (loss) related to ineffectiveness 0 0 0  
Total floorplan interest expense 59,882,000 52,372,000 44,927,000  
Amount expected to be reclassified out of other comprehensive income (loss) into earnings as additional floorplan interest expense or other interest expense in the next twelve months 4,200,000      
Level 2        
Derivative Instruments, Gain (Loss) [Line Items]        
Fair value of liabilities from interest rate risk management activities 1,811,000 10,579,000    
Fair value of assets from interest rate risk management activities 13,576,000 9,501,000    
Floorplan Interest Expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Impact of interest rate hedges on floorplan interest expense (4,671,000) (10,272,000) $ (11,097,000)  
Interest Rate Derivative Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Aggregate notional value $ 753,100,000 $ 623,000,000    
Weighted average derivative interest rate 2.40% 2.50%    
Interest Rate Swaps with Forward Start Dates        
Derivative Instruments, Gain (Loss) [Line Items]        
Aggregate notional value $ 275,000,000     $ 150,000,000
Weighted average derivative interest rate 1.90%      
Number of additional forward interest rate swaps | derivative_instrument 5