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Derivative Instruments - Changes In Accumulated Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2018
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Net derivative settlement termination payment amount $ 1,200 $ 1,200  
Cash flow hedges | Derivatives designated as hedging instruments | Foreign currency exchange forward contracts | Product sales.      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) in Other Comprehensive Income on Derivative (Effective Portion) (1,484) (3,445)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 26 26  
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (1) (1)  
Cash flow hedges | Derivatives designated as hedging instruments | Foreign currency exchange forward contracts | Other revenue      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) in Other Comprehensive Income on Derivative (Effective Portion) (22) (11)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (30) (11)  
Cash flow hedges | Derivatives designated as hedging instruments | Foreign currency exchange purchased option contracts | Product sales.      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) in Other Comprehensive Income on Derivative (Effective Portion) (294) (1,047)  
Cash flow hedges | Derivatives designated as hedging instruments | Interest rate swap contracts | Other income      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) in Other Comprehensive Income on Derivative (Effective Portion) 12    
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 13 13  
Cash flow hedges | Derivatives designated as hedging instruments | Interest rate swap contracts | Other expense      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) in Other Comprehensive Income on Derivative (Effective Portion)   (138)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income $ (51) $ (176)  
Cash flow hedges | Derivatives designated as hedging instruments | Forecast      
Gains (losses) of derivative instruments designated as cash flow hedges in other comprehensive income      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income     $ 800