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Derivatives - Foreign currency agreements-Additional Information (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Forward Rate Contract Expiration Frequency | Monthly intervals up to February 2016 | Monthly intervals up to September 2015 |
Foreign currency agreements value | $ 23,000 |  | $ 22,500
Gain (Loss) on derivative instruments from forward contracts | $ 519 | $ 0 |
Number of foreign currency agreements (Euro/US dollar contracts) | 16 |  | 9
Average forward rate | 1.112 |  | 1.273

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- Definition Average contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition Number of foreign currency exchange rate derivatives held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 + Details
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