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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Change in unrealized gain (loss) on interest rate swaps $ (26,998) $ (19,333) $ 3,837
Amortization (accretion) of interest rate swaps to interest expense 8,427 (6,380) (12,198)
Change in unrealized loss on interest rate swaps, net $ (18,571) $ (25,713) $ (8,361)