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Fair Value Measurements and Derivative Instruments (Offsetting of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Offsetting of Financial Assets under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet $ 39,994 $ 65,297
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities (39,994) (60,303)
Cash Collateral Received 0 0
Net Amount of Derivative Assets 0 4,994
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet (257,728) (201,812)
Gross Amount of Eligible Offsetting Recognized Derivative Assets 39,994 60,303
Cash Collateral Pledged 0 0
Net Amount of Derivative Liabilities $ (217,734) $ (141,509)