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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 322,656	$ 281,488	$ 262,179
Other comprehensive income, net of tax
Currency translation adjustment	(26,522)	33,966	(12,839)
Currency impact of long-term funding	(4,834)	13,730	(8,428)
Unrealized capital (loss)/gain– investments	(155)	(272)	11
Actuarial gain/(loss) on defined benefit pension plan	2,855	50	(2,485)
Amortization of interest rate hedge	(923)	(923)	(923)
Fair value of cash flow hedge	(1,036)	1,036	0
Total comprehensive income	$ 292,041	$ 329,075	$ 237,515

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Adjustment that results from the process of translating the impact of long-term funding into the functional currency of the reporting entity.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, 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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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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