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Collateralized Receivables and Transfers of Financial Assets, Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds $ 600      
Notes and other receivables, net 157,926 $ 160,077   $ 157,926
Collateralized Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Allowance 0 $ (807) $ (936)  
Receivable with Imputed Interest, Effective Yield (Interest Rate)   9.90%    
Receivable With Imputed Interest, Term   14 years 1 month 6 days    
Financing Receivable, before Allowance for Credit Loss 0 $ 107,731 129,182  
Interest Income (Expense), Net $ 8,000 11,200 $ 13,200  
Reported Value Measurement [Member] | Collateralized Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes and other receivables, net   106,900    
Reported Value Measurement [Member] | Fair Value, Recurring [Member] | Collateralized Receivables [Member] | Secured Debt [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss   $ 107,700