Fair Value of Financial Instruments - Level 3 Liabilities (Details) - Level 3 - Recurring basis - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Agreements with Non-mark-to-market Collateral Provisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 628,280	$ 1,159,213
Issuances	0	0
Payment of principal	(63,165)	(117,695)
Changes in unrealized losses	(1,255)	(235)
Balance at end of period	563,860	1,041,283
Agreements with Mark-to-market Collateral Provisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,322,362	1,124,162
Issuances	469,484	91,997
Payment of principal	(236,596)	(236,618)
Changes in unrealized losses	0	0
Balance at end of period	$ 1,555,250	$ 979,541