Derivative Instruments (Impact of Derivative Instruments on the Consolidated Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gain (loss) on derivative instruments recognized in income	$ 4,399	$ 4,016	$ (2,284)
Foreign Exchange Contracts
Derivative [Line Items]
Gain (loss) on derivative and financial instruments designated as hedges recognized in OCI	(131,120)	211,390
Gain (loss) on derivative and financial instruments designated as hedges recognized in OCI			(252,168)
Designated as Hedging Instrument
Derivative [Line Items]
Gain (loss) on derivative instruments recognized in income	26,419	12,271	(2,476)
Not Designated as Hedging Instrument
Derivative [Line Items]
Gain (loss) on derivative instruments recognized in income	$ (2,310)	$ 5,233	$ (49)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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