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Derivative Instruments Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments [Abstract]        
Foreign Currency Contract, Asset, Fair Value Disclosure $ 2,543   $ 2,543  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,903 $ 156 1,903 $ 156
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 511 $ 26 $ 725 $ 13