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Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ (293)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 293
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net $ 0