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Notes Receivable (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in allowance for loan losses $ 12,000    
Notes receivable   $ 544,806 $ 551,393
Accrued interest   $ 3,800 $ 3,900
Notes Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Weighted-average interest rate   15.10% 15.00%
Over 91 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   $ 23,910 $ 23,963