Hedging - Notional Amount (Details) - Cash Flow Hedging - Foreign currency forward contracts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 209,285	$ 33,724
Designated as Hedging Instrument | Euro
Derivative [Line Items]
Notional amount of foreign currency forward contract	103,362	20,209
Designated as Hedging Instrument | British pound sterling
Derivative [Line Items]
Notional amount of foreign currency forward contract	78,756	13,515
Designated as Hedging Instrument | Australian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 27,167	$ 0
Minimum
Derivative [Line Items]
Derivative term	1 month
Maximum
Derivative [Line Items]
Derivative term	18 months