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Finance Receivables - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Length of economic forecastt 2 years        
Length of mean reversion process 3 years        
Receivables past due and accruing interest $ 34,817 $ 33,079 $ 48,026 $ 42,336 $ 40,076
Retail          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Approved but unfunded retail loans $ 175,900 134,900      
Threshold period past due to be charged-off 120 days        
Reversal of accrued interest against interest income $ (16,800) (19,100)      
Receivables past due and accruing interest 34,800 33,100      
Wholesale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unused lines of credit, wholesale 1,700,000 1,640,000      
Reversal of accrued interest against interest income $ 0 $ 400      
Texas | Finance receivables | Geographic Concentration Risk          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk (as a percent) 11.00% 11.00%