Fair Value Measurements and Derivative Instruments (Offsetting of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Offsetting of Financial Assets under Master Netting Agreements [Abstract]
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet	$ 69,808	$ 108,539
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	(67,995)	(80,743)
Cash Collateral Received	0	0
Net Amount of Derivative Assets	1,813	27,796
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet	(200,541)	(259,705)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	67,995	80,743
Cash Collateral Pledged	44,411	57,273
Net Amount of Derivative Liabilities	$ (88,135)	$ (121,689)