Derivative Instruments - Fair Value of Reported Derivatives (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	$ 2,500,000	$ 2,485,000
Derivative assets, at fair value	6,328	4,096
Derivative liabilities, at fair value	0	0
Future
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	0
Derivative assets, at fair value	0
Derivative liabilities, at fair value	0
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	1,000,000	1,485,000
Derivative assets, at fair value	6,107	3,716
Derivative liabilities, at fair value	0	0
Swaptions
Derivatives, Fair Value [Line Items]
Notional Amount Outstanding	1,500,000	1,000,000
Derivative assets, at fair value	221	380
Derivative liabilities, at fair value	$ 0	$ 0