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Derivatives and Hedging Instruments Derivatives and Hedging Instruments - Summary of Effects of Derivatives on Cash Flow Hedging Relationships in Company's Statements of Income, Derivatives Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - Cash Flow Hedges - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other (expense) income | Foreign currency exchange contracts |  |  |
Derivative [Line Items] |  |  |
Net gain (loss) on derivative contracts | $ 1,755 | $ 8,248 | $ 0
Interest expense | Interest rate cap contracts |  |  |
Derivative [Line Items] |  |  |
Net gain (loss) on derivative contracts | 2,026 | 0 | 0
Interest expense | Interest rate swap agreements |  |  |
Derivative [Line Items] |  |  |
Net gain (loss) on derivative contracts | $ 110 | $ 144 | $ 92

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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/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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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