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Loans and Finance Receivables Held for Investment and Allowance for Credit Losses (Non-delinquent, Paying and Non-paying Delinquent Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Current loans and finance receivables $ 1,078,904 $ 1,031,449
Delinquent: paying (accrual status) 34,888 54,427
Delinquent: non-paying (non-accrual status) 89,530 59,078
Total unpaid principal balance $ 1,203,322 $ 1,144,954