Fair Value Measurements and Derivative Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 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	$ 82,499	$ 108,539
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	(60,816)	(80,743)
Cash Collateral Received	0	0
Net Amount of Derivative Assets	21,683	27,796
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet	(156,771)	(259,705)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	60,816	80,743
Cash Collateral Pledged	60,934	57,273
Net Amount of Derivative Liabilities	$ (35,021)	$ (121,689)