Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Foreign currency forward contract not designated as cash flow hedge (Details 8)

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Fair Value Measurements and Derivatives - Foreign currency forward contract not designated as cash flow hedge (Details 8) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts        
Derivative Instruments Gain Loss [Line Items]        
Gain recognized in other income (expense) $ 99   $ 99