Derivatives - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maturity of foreign currency exchange contracts		9 months
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency exchange contracts	[1]	$ (1,251)	$ 294	$ (491)
Not designated as hedging instrument | Foreign Currency Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on foreign currency exchange contracts		$ (1,300)	$ 300	$ (500)

[1] This represents the gains and (losses) incurred on foreign currency hedging derivatives (see Note 20 for further details).