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Derivative Instruments (Fair Value Hedges) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in Income on hedging derivatives $ (7,065) $ (3,065) $ (2,894)
Cross-Currency Interest Rate Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss recognized in Income on hedging derivatives (9,599) (5,814)  
Gain recognized in Income on hedging items 4,118 2,877  
Loss on fair value hedge ineffectiveness $ 5,481 $ 2,937