Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Other expense - net - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	$ (240)	$ (303)	$ 1,050	$ (1,033)
Foreign exchange contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	$ (240)	$ (303)	$ 1,050	$ (1,033)

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration