Fair Value of Financial Instruments - Reconciliation Level Three, Beneficial Interests in Securitizations (Details) - Variable Interest Entity, Not Primary Beneficiary - Level 3 - Fair Value, Measurements, Recurring $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Opening Balance	$ 0
Transfers into Level 3	80,081
Cash receipts	(9,559)
Change in fair value	(964)
Ending Balance	$ 69,558