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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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