INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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	$ 144,242	$ 124,492	$ 68,250
State and local income taxes, net of federal tax benefit	17,979	12,904	4,005
Excess tax benefits resulting from exercises of stock-based compensation	(10,742)	(2,500)	(4,681)
Foreign Derived Intangible Income Deduction	(10,411)	(13,356)	(2,197)
Foreign rate variance	6,854	5,020	2,131
Valuation allowances	(4,135)	(4,547)	(4,209)
Research and development credit	(9,600)	(6,800)	(5,300)
Pension plan termination adjustment	0	0	(14,711)
U.S. tax cost of foreign source income	1,013	783	3,488
Other	6,418	4,607	1,642
Total	$ 141,618	$ 120,603	$ 48,418
Effective tax rate	20.60%	20.30%	14.90%
Total income tax payments, net of refunds	$ 180,512	$ 151,818	$ 87,288