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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Outstanding amount of Senior Bonds | $ 605,712 |  | $ 684,420
Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value | 1,290,029 |  | 1,290,029
Outstanding amount of Senior Bonds | $ 605,712 |  | $ 684,420
Weighted average interest rate | 3.67% |  | 3.66%
Weighted average contractual maturity of Senior Bonds | 30 years | 31 years |
Cash received | $ 802,815 | $ 802,815 |
Debt issuance cost | 3,200 |  | $ 3,800
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal amount of Securitized debt | 802,817 |  | 802,817
Proceeds from Senior bond sold with Step up feature | $ 521,800 |  | $ 582,800
Debt instrument, basis spread on variable rate | 3.00% |  |
Debt instrument, coupon step-up period |  |  | 36 months
Senior Support Certificates | Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal amount of Securitized debt | $ 275,174 |  | $ 275,174

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