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Derivatives and Hedging Instruments - Effects of Derivatives Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - Cash Flow Hedging - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Foreign currency exchange contracts | Other (expense) income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | $ (6,174) | $ 2,875 | $ (6,940) | $ 2,623
Interest rate cap contracts | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | (1,628) | 0 | (1,716) | 0
Interest rate swap agreements | Interest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | $ 0 | $ 33 | $ 0 | $ 110

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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