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Hedging (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Derivatives
Jun. 30, 2014
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Derivatives, Fair Value [Line Items]                
Maximum Length of Time Hedged in Cash Flow Hedge     2 years          
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 79 $ 98 $ 70 $ 397        
Unrealized loss on hedge instruments (685) (268) (685) (268) $ (634) $ (752) $ (360) $ (875)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (130) (6) (3) 210        
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 79              
Hedge Loss Recognized in Other Comprehensive Income (Loss) (51) 92 67 607        
Cost of Sales [Member]                
Derivatives, Fair Value [Line Items]                
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 33 27 29 113        
Research and Development Expense [Member]                
Derivatives, Fair Value [Line Items]                
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 55 45 49 187        
Selling, General and Administrative Expenses [Member]                
Derivatives, Fair Value [Line Items]                
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (9) $ 26 (8) $ 97        
Other Current Assets [Member]                
Derivatives, Fair Value [Line Items]                
Cash Flow Hedge Derivative Instrument Assets at Fair Value 0   0     0    
Other Accrued Liabilities [Member]                
Derivatives, Fair Value [Line Items]                
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value (95)   (95)     (83)    
Foreign Exchange Forward [Member]                
Derivatives, Fair Value [Line Items]                
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     (500)          
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives $ 8,179   $ 8,179     $ 14,193    
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]                
Derivatives, Fair Value [Line Items]                
Derivative, Number of New Instruments During Period | Derivatives     18          
Derivative, New Instruments During Period, Notional Amount     $ 11,600