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Derivatives - Foreign Currency Forward Contracts (Details) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Nov. 29, 2013 30 Day Forward Contract EURO EUR (€) | Nov. 30, 2012 30 Day Forward Contract EURO EUR (€) | Nov. 29, 2013 30 Day Forward Contract GBP GBP (£) | Nov. 30, 2012 30 Day Forward Contract GBP GBP (£)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Forward Contract Term |  |  |  | 30 days | 30 days | 30 days | 30 days
Derivative, Notional Amount |  |  |  | € 494 | € 527 | £ 847 | £ 565
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (202) | $ (11) | $ 221 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Forward Contract Term + References No definition available. + Details
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- Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: 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 + Details
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