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Financial Instruments - Derivatives and Hedging (Infective Portion) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Change in unrealized gain (loss) on interest rate swaps $ 132 $ 79 $ (532) $ (1,704)
Amortization of interest rate swaps to interest expense (1,094) 1,242 (902) 4,117
Change in unrealized gain (loss) on interest rate swaps, net $ (962) $ 1,321 $ (1,434) $ 2,413