Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details 6) - Other expense - net - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	$ (1,042)	$ (511)	$ 1,256
Foreign exchange contracts
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments	$ (1,042)	$ (511)	$ 1,256

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=56946850&loc=SL5624171-113959

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