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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Change in unrealized gain (loss) on interest rate swaps $ (6,944) $ 7,234
Accretion of interest rate swaps to interest expense (3,113) (2,461)
Change in unrealized gain (loss) on interest rate swaps, net $ (10,057) $ 4,773