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Derivatives (Foreign Exchange Contracts) (Details)
€ in Thousands, ₨ in Thousands, £ in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
GBP (£)
Mar. 31, 2016
INR (₨)
Derivative [Line Items]          
Foreign currency transaction gain (loss) $ 100 $ (100)      
Sells Indian rupee (INR)/Buys USD Forward          
Derivative [Line Items]          
Derivative, Notional Amount 6,553       ₨ 456,000
Sells euro (EUR)/Buys USD Forward          
Derivative [Line Items]          
Derivative, Notional Amount 6,396   € 5,900    
Sells pound sterling (GBP)/Buys USD Forward          
Derivative [Line Items]          
Derivative, Notional Amount $ 4,705     £ 3,200