Fair Value Definition and Hierarchy - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Level 1 | Carrying Amount
Financial assets:
Cash, cash equivalents and restricted cash	$ 168,292	$ 99,331
Life insurance policy benefits receivable, net	19,789	23,031
Fees receivable	31,611	29,168
Level 1 | Estimated Fair Value
Financial assets:
Cash, cash equivalents and restricted cash	168,292	99,331
Life insurance policy benefits receivable, net	19,789	23,031
Fees receivable	31,611	29,168
Level 2 | Carrying Amount
Financial assets:
Financing receivables from affiliates	69,428	67,153
Financial liabilities:
Senior credit facility	203,578	174,390
L Bonds and Seller Trust L bonds	1,439,865	1,293,530
Other borrowings	152,118	153,086
Level 2 | Estimated Fair Value
Financial assets:
Financing receivables from affiliates	62,510	59,608
Financial liabilities:
Senior credit facility	213,117	184,587
L Bonds and Seller Trust L bonds	1,421,907	1,390,288
Other borrowings	152,118	153,086
Level 3 | Carrying Amount
Financial assets:
Loans receivable, net of allowance for loan losses and unearned income	210,548	232,344
Level 3 | Estimated Fair Value
Financial assets:
Loans receivable, net of allowance for loan losses and unearned income	$ 221,507	$ 232,344