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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,829,108	$ 1,734,266	$ 1,739,907	$ 1,738,778
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			1,844
Amounts reclassified from accumulated other comprehensive loss			432
Total other comprehensive income (loss), net of tax	881	1,169	2,276	(10,675)
Ending balance	1,805,606	1,708,625	1,805,606	1,708,625
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(18,349)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			2,679
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive income (loss), net of tax			2,679
Ending balance	(15,670)		(15,670)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			1,551
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications			(835)
Amounts reclassified from accumulated other comprehensive loss			432
Total other comprehensive income (loss), net of tax			(403)
Ending balance	1,148		1,148
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(15,403)	(35,348)	(16,798)	(23,504)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive income (loss), net of tax	881	1,169	2,276	(10,675)
Ending balance	$ (14,522)	$ (34,179)	$ (14,522)	$ (34,179)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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