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Debt Instruments - Finance Receivable Facilities (Details) - USD ($)
1 Months Ended
May 31, 2019
Apr. 30, 2019
Dec. 31, 2019
May 07, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Line of credit, outstanding     $ 568,840,000   $ 196,963,000  
Restricted cash     $ 42,443,000   $ 9,848,000 $ 14,443,000
Revolving Credit Facility | DART I Credit Facility | Minimum            
Debt Instrument [Line Items]            
Interest rate     2.76%      
Revolving Credit Facility | DART I Credit Facility | Maximum            
Debt Instrument [Line Items]            
Interest rate     3.56%      
Revolving Credit Facility | SART 2017-1 Credit Facility            
Debt Instrument [Line Items]            
Interest rate     3.71%      
Revolving Credit Facility | Finance Receivable Facilities [Member]            
Debt Instrument [Line Items]            
Line of credit, outstanding     $ 53,400,000      
Line of credit facility, remaining borrowing capacity     596,600,000      
Restricted cash     $ 3,700,000      
Loan And Security Agreement | Revolving Credit Facility | DART I Credit Facility | Ally Bank            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity (up to)   $ 300,000,000.0        
Deposit required under floor plan facility, percentage of principal balance 2.00%          
Loan And Security Agreement | Revolving Credit Facility | DART I Credit Facility | Ally Bank | Minimum | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate   1.00%        
Loan And Security Agreement | Revolving Credit Facility | DART I Credit Facility | Ally Bank | Maximum | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate   1.80%        
A&R Loan and Security Agreement | Revolving Credit Facility | SART 2017-1 Credit Facility | Ally Bank            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity (up to) $ 350,000,000.0     $ 350,000,000.0    
Deposit required under floor plan facility, percentage of principal balance 2.00%          
A&R Loan and Security Agreement | Revolving Credit Facility | SART 2017-1 Credit Facility | Ally Bank | LIBOR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.95%