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Derivatives Not Designated as Hedging Relationships (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Other Income (Expense) [Member] |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Foreign exchange forward contracts | $ (1,523) | $ (1,742)
Interest Rate Cap [Member] | Interest Expense [Member] |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | $ 282 | $ (126)

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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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: 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=84234895&loc=SL5618551-113959 + Details
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