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STOCKHOLDERS' EQUITY - Schedule of OCI (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,235,552	$ 1,957,639
Other comprehensive loss before reclassifications	(292)	1,159
Amounts reclassified from accumulated other comprehensive loss	(271)	25
Net current period change in accumulated other comprehensive loss, before tax	(563)	1,184
Income tax expense related to items of other comprehensive income	170
Ending balance	3,457,590	1,730,686
Unrealized Gain (Loss) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	526	(75)
Other comprehensive loss before reclassifications	(292)	1,159
Amounts reclassified from accumulated other comprehensive loss	(271)	0
Net current period change in accumulated other comprehensive loss, before tax	(563)	1,159
Ending balance	133	1,084
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	526	(100)
Ending balance	$ 133	1,084
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(25)
Other comprehensive loss before reclassifications		0
Amounts reclassified from accumulated other comprehensive loss		25
Net current period change in accumulated other comprehensive loss, before tax		25
Ending balance		$ 0

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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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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