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Derivatives Not Designated as Hedging Relationships (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Income (Expense) [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Foreign exchange forward contracts | $ (1,149) | $ (1,760) | $ 964 | $ (5,565)
Interest Rate Cap [Member] | Interest Expense [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Interest rate cap contracts | $ 0 | $ (36) | $ 377 | $ (337)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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