Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Foreign Exchange Contracts by Currency (Details)

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Fair Value Measurements - Foreign Exchange Contracts by Currency (Details) - Foreign Exchange Forward Contracts - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Derivative [Line Items]    
Notional amount $ 10,350 $ 18,716
Russian Ruble    
Derivative [Line Items]    
Notional amount 1,500 2,416
Euro    
Derivative [Line Items]    
Notional amount 1,000 750
Canada, Dollars    
Derivative [Line Items]    
Notional amount 4,000 4,000
South Korean Won    
Derivative [Line Items]    
Notional amount 3,000 10,500
Mexican Peso    
Derivative [Line Items]    
Notional amount 200 200
Australian Dollar    
Derivative [Line Items]    
Notional amount $ 650 $ 850