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Financial Instruments (Investment and Derivative Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Foreign exchange contracts        
Fair Value Measurements        
Assets related to derivative instruments $ 0   $ 0  
Liabilities related to derivative instruments 0   0  
Foreign exchange contracts | Not designated as hedging instrument        
Fair Value Measurements        
Notional principal amount of foreign exchange contracts 10,500   10,500  
Foreign exchange contracts | Other income (expense), net | Not designated as hedging instrument        
Fair Value Measurements        
Foreign exchange forward contracts $ 494 $ (405) $ (54) $ (932)
Minimum        
Fair Value Measurements        
Maturity period of long-term investments     1 year  
Maximum        
Fair Value Measurements        
Maturity period of long-term investments     2 years