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INCOME TAXES - Reconciliation of Effective Income Tax Rate from Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal income taxes at statutory rates	$ (26,227)	$ (28,318)	$ (2,424)
Valuation allowance	(5,881)	727	510
State income taxes, net of federal benefit and tax credits	(6,994)	(4,450)	(3,329)
Permanent differences	1,773	2,606	1,302
GILTI, FDII, and BEAT (1)	0	0	399
Federal research and experimentation credits	(5,716)	(4,295)	(6,991)
Tax effects of foreign activities	3,050	3,056	(399)
Tax-exempt income	0	(91)	(137)
Provision to return adjustments	3,416	(5,460)	253
Non-deductible compensation	1,806	1,716	1,025
Expiration of statutes and changes in estimates	55	2,420	(516)
Excess tax benefits related to share-based compensation	(25,797)	(14,291)	(13,541)
Cares Act	(10,576)
Impact of change in tax law	7,489	1,908	1,636
Other	86	59	52
Income tax expense (benefit), total	$ (63,516)	$ (44,413)	$ (22,160)

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