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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Financing VIEs Securitized Debt by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Total	$ 214,282
Carrying value	42,335	$ 81,537
Financing VIE
Variable Interest Entity [Line Items]
Within 24 months	12,381	53,089
Over 24 months to 36 months	0	0
Over 36 months	33,177	33,350
Total	45,558	86,439
Discount	(2,983)	(4,232)
Debt issuance cost	(240)	(670)
Carrying value	$ 42,335	$ 81,537

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Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twenty Four Months

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