Derivatives - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	9 months
Net gain (loss) on foreign currency exchange contracts	$ (491)	[1]	$ 888	[1]	$ 35	[1]
Not designated as hedging instrument | Foreign currency exchange futures contracts | Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency exchange contracts	$ (491)		$ 888		$ 35

[1] This represents the gains and (losses) incurred on foreign currency hedging derivatives (see Note 19 for further details).