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Comprehensive Income (Loss) - Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Loss:
Beginning balance	$ 118,880	$ 182,125	$ 162,266	$ (29,199)
Net other comprehensive (loss) income	(22,396)	(11,103)	(56,721)	19,194
Ending balance	98,957	171,200	98,957	171,200
Foreign currency translation adjustment
Accumulated Other Comprehensive Loss:
Beginning balance	(23,229)	(23,733)	(22,627)	(23,738)
Net other comprehensive (loss) income	(237)	534	(839)	539
Ending balance	(23,466)	(23,199)	(23,466)	(23,199)
Unrealized gain on marketable debt securities, net
Accumulated Other Comprehensive Loss:
Beginning balance	879	1,215	1,576	932
Net other comprehensive (loss) income	(157)	66	(854)	349
Ending balance	722	1,281	722	1,281
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Loss:
Beginning balance	(22,350)	(22,518)	(21,051)	(22,806)
Ending balance	$ (22,744)	$ (21,918)	$ (22,744)	$ (21,918)

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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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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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