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Allowance for Doubtful Accounts - Allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts receivable      
Accounts receivable, Allowance for doubtful accounts, beginning balance $ 39,903    
Write-Offs (31,139)    
Bad Debt Expense 5,579    
Accounts receivable, Allowance for doubtful accounts, ending balance 51,052 $ 39,903  
Notes receivable      
Balance End of Year 16,749 12,490 $ 13,472
Write-Offs (5,325)    
Bad Debt Expense 4,057    
Balance Beginning of Year 12,490 13,472 2,884
Allowance for doubtful accounts, beginning balance 52,393    
Write-Offs (36,464)    
Bad Debt Expense 9,636 25,480 $ 51,387
Allowance for doubtful accounts, ending balance 67,801 52,393  
Accounts receivable recovered after write off 1,000    
Cumulative Impact from Adopting ASC 326 Guidance      
Accounts receivable      
Accounts receivable, Allowance for doubtful accounts, beginning balance 36,709    
Accounts receivable, Allowance for doubtful accounts, ending balance   36,709  
Notes receivable      
Balance End of Year   5,527  
Balance Beginning of Year 5,527    
Allowance for doubtful accounts, beginning balance 42,236    
Allowance for doubtful accounts, ending balance   42,236  
Standard notes receivable      
Notes receivable      
Balance End of Year 13,258 6,667  
Write-Offs (2,238)    
Bad Debt Expense 3,593    
Balance Beginning of Year 6,667    
Standard notes receivable | Cumulative Impact from Adopting ASC 326 Guidance      
Notes receivable      
Balance End of Year   5,236  
Balance Beginning of Year 5,236    
Elevated risk notes receivable      
Notes receivable      
Balance End of Year 3,491 5,823  
Write-Offs (3,087)    
Bad Debt Expense 464    
Balance Beginning of Year 5,823    
Elevated risk notes receivable | Cumulative Impact from Adopting ASC 326 Guidance      
Notes receivable      
Balance End of Year   $ 291  
Balance Beginning of Year $ 291