Derivatives - Additional Disclosures (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments,Gain (Loss) [Line Items]
Net loss on foreign currency exchange contracts	[1]	$ 1,598	$ 477	$ 1,364	$ 676
Other income (expense), net | Not designated as hedging instrument | Foreign currency exchange contracts
Derivative Instruments,Gain (Loss) [Line Items]
Net loss on foreign currency exchange contracts		$ 1,600	$ 500	$ 1,400	$ 700

[1] This represents the gains (losses) incurred on foreign currency hedging derivatives (see Note 17 for further details).