Fair Value Measurements and Derivative Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Offsetting of Financial Assets under Master Netting Agreements [Abstract]
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet	$ 97,519	$ 108,539
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	(66,874)	(80,743)
Cash Collateral Received	0	0
Net Amount of Derivative Assets	30,645	27,796
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet	(173,193)	(259,705)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	66,874	80,743
Cash Collateral Pledged	65,581	57,273
Net Amount of Derivative Liabilities	$ (40,738)	$ (121,689)