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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,294,500	$ 1,263,168	$ 1,211,018	$ 1,311,192
Other comprehensive loss	(11,215)		(16,383)
Other comprehensive loss, net of tax	(11,215)	(3,194)	(16,383)	(11,532)
Ending balance	1,369,259	1,176,337	1,369,259	1,176,337
Unrealized Gains (Losses) on Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	283		283
Other comprehensive loss	(114)		(114)
Other comprehensive loss, net of tax	(114)		(114)
Ending balance	169		169
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(60,257)		(55,089)
Other comprehensive loss	(11,101)		(16,269)
Other comprehensive loss, net of tax	(11,101)		(16,269)
Ending balance	(71,358)		(71,358)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(59,974)	(54,800)	(54,806)	(46,462)
Other comprehensive loss, net of tax	(11,215)	(3,194)	(16,383)	(11,532)
Ending balance	$ (71,189)	$ (57,994)	$ (71,189)	$ (57,994)

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

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