Derivative Financial Instruments and Hedging Activities - Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign currency exchange contracts \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged item, gain (loss) recognized in other comprehensive income	$ 2,100	$ 867	$ (205)
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign currency option contracts \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged item, gain (loss) recognized in other comprehensive income	(52)	1,035	370
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate swaps \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged item, gain (loss) recognized in other comprehensive income	4,214	21,422	(10,197)
Designated as Hedging Instrument \| Net Investment Hedging \| Foreign currency exchange contracts \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged item, gain (loss) recognized in other comprehensive income	0	0	2,875
Designated as Hedging Instrument \| Net Investment Hedging \| Foreign currency option contracts \| Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged item, gain (loss) recognized in other comprehensive income	0	(4,606)	4,606
Not Designated as Hedging Instrument \| Foreign currency exchange contracts \| Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	0	895	0
Not Designated as Hedging Instrument \| Foreign currency exchange contracts \| Interest income and miscellaneous income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	47	0	0
Not Designated as Hedging Instrument \| Foreign currency option contracts \| Other operating (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	0	258	1,394
Not Designated as Hedging Instrument \| Interest rate swaps \| Interest income and miscellaneous income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	$ 0	$ (1,219)	$ (4,391)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying 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

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