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Derivative Instruments (Fair Value Hedges) (Details) - Cross-Currency Interest Rate Swaps [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Loss recognized in Income on hedging derivatives $ (5,814)
Gain recognized in Income on hedging items 2,877
Loss on fair value hedge ineffectiveness $ 2,938