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Financial Instruments (Investment and Derivative Information) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Foreign Exchange Contract  
Fair Value Measurements  
Assets related to derivative instruments $ 0
Liabilities related to derivative instruments 0
Notional principal amount of foreign exchange contracts 10,500
Foreign Exchange Contract | Other Income Expense | Not Designated as Hedging Instrument  
Fair Value Measurements  
Foreign exchange contracts $ (317)
Minimum  
Fair Value Measurements  
Maturity period of long-term investments 1 year
Maximum  
Fair Value Measurements  
Maturity period of long-term investments 2 years