Derivative Instruments (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments Under ASC 815	$ 1,256	$ 963	$ (189)
Foreign exchange contracts \| Other expense - net
Derivative Instruments
Amount of Gain or (Loss) Recognized in Income on Derivatives Not Designated as Hedging Instruments Under ASC 815	$ 1,256	$ 963	$ (189)

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=7476318&loc=SL5624171-113959

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