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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total | $ 226,254 |
Carrying value | $ 0 | $ 42,335
Financing VIE |  |
Variable Interest Entity [Line Items] |  |
Within 24 months |  | 12,381
Over 24 months to 36 months |  | 0
Over 36 months |  | 33,177
Total |  | 45,558
Discount |  | (2,983)
Debt issuance cost |  | (240)
Carrying value |  | $ 42,335

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