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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments [Abstract]        
Foreign Currency Contract, Asset, Fair Value Disclosure $ 307   $ 307  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 161 $ 1,903 161 $ 1,903
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 3 $ 511 $ 0 $ 1