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Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,738,778	$ 1,593,147
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income (loss) before reclassifications	5,994	9,104	$ (13,153)
Amounts reclassified from accumulated other comprehensive loss	712	392	61
Total other comprehensive income (loss), net of taxes	6,706	9,496	(13,092)
Ending balance	1,739,907	1,738,778	1,593,147
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(23,969)	(31,587)	(19,522)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income (loss) before reclassifications	5,620	7,618	(12,065)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss), net of taxes	5,620	7,618	(12,065)
Ending balance	(18,349)	(23,969)	(31,587)
Unrealized Holding Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	465	(1,413)	(386)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income (loss) before reclassifications	374	1,486	(1,088)
Amounts reclassified from accumulated other comprehensive loss	712	392	61
Total other comprehensive income (loss), net of taxes	1,086	1,878	(1,027)
Ending balance	1,551	465	(1,413)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(23,504)	(33,000)	(19,908)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive income (loss), net of taxes	6,706	9,496	(13,092)
Ending balance	$ (16,798)	$ (23,504)	$ (33,000)

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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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