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INCOME TAXES (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective tax rate reconciliation [Abstract]
Expected federal income tax provision at statutory rate									$ 82,099	$ 59,643	$ 57,770
State income taxes, net of federal benefit									14,884	10,312	4,776
Foreign income taxes, net effect									1,515	(315)	(3,540)
Increase (decrease) in valuation allowance									(693)	1,214	3,624
Tax rate changes									(13)	141	(7,340)
Research credits									(12,188)	(15,373)	(20,547)
Excess tax benefit									(15,282)	(14,227)	(7,010)
Tax reserves									3,135	1,870	12,646
Other adjustments									2,529	2,416	1,984
Income tax expense	$ 26,378	$ 20,304	$ 16,768	$ 12,536	$ 26,060	$ 14,247	$ 1,863	$ 3,511	$ 75,986	$ 45,681	$ 42,363

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