Derivative Financial Instruments and Hedging Activities - Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ (4,357)	$ 2,100	$ 867
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	(180)	(52)	1,035
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	8,296	4,214	21,422
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	(344)	0	0
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	0	(4,606)
Not Designated as Hedging Instrument | Foreign currency exchange contracts | Other operating income, net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	0	0	895
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	2,183	47	0
Not Designated as Hedging Instrument | Foreign currency option contracts | Other operating income, net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	0	0	258
Not Designated as Hedging Instrument | Carbon options | Interest income and miscellaneous income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Non-designated hedged item, gain (loss) recognized in income	(158)	0	0
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	$ 0	$ (1,219)