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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Change in unrealized gain (loss) on interest rate swaps, net (Note 6) $ (12,306) $ 3,001 $ (19,250) $ 10,235
Accretion of interest rate swaps to interest expense (1,678) (3,582) (4,791) (6,043)
Change in unrealized gain (loss) on interest rate swaps, net $ (13,984) $ (581) $ (24,041) $ 4,192