Financing Agreements - Borrowings Under Repurchase Agreement (Details) - Repurchase Agreement Borrowings - Fair Value - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 3,227,558	$ 3,501,875
Weighted Average Interest Rate	6.58%	2.38%
Within 30 days
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 3,060,111	$ 3,222,268
Weighted Average Interest Rate	6.60%	2.36%
Over 30 days to 3 months
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 167,447	$ 257,444
Weighted Average Interest Rate	6.19%	2.49%
Over 3 months to 12 months
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 0	$ 22,163
Weighted Average Interest Rate	0.00%	4.50%
Over 12 months
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 0	$ 0
Weighted Average Interest Rate	0.00%	0.00%