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Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 6,536 $ 5,867
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (6,536) (5,867)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net $ 0 $ 0