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INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Differences between total income tax expense and the amount computed by applying the statutory federal income tax rate to income before income taxes
Statutory rate applied to pre-tax income	$ 55,448	$ 77,384	$ 77,419
State and local income taxes, net of federal tax benefit	6,149	8,830	8,844
Net impact of the U.S. Tax Act	0	0	4,823
Foreign withholding taxes	0	0	(4,424)
Resolution and settlements to uncertain tax positions	(4,146)	(9,432)	(457)
Foreign Derived Intangible Income Deduction	(1,267)	(4,315)	(2,647)
Foreign rate variance	85	7,023	(4,560)
Valuation allowances	4,753	3,198	5,596
Research and development credit	(4,400)	(4,786)	(3,859)
Other	1,274	(2,492)	932
Total	$ 57,896	$ 75,410	$ 81,667
Effective tax rate	21.90%	20.50%	22.20%
Total income tax payments, net of refunds	$ 59,360	$ 42,880	$ 85,805

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