INCOME TAXES (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	$ 68,250	$ 55,448	$ 77,384
State and local income taxes, net of federal tax benefit	4,005	6,148	8,831
Excess tax benefits resulting from exercises of stock-based compensation	(4,681)	(2,471)	(3,451)
Resolution and settlements to uncertain tax positions	577	(4,146)	(9,432)
Foreign Derived Intangible Income Deduction	(2,197)	(1,267)	(4,315)
Foreign rate variance	2,131	85	7,023
Valuation allowances	(4,209)	4,753	3,198
Research and development credit	(5,300)	(4,400)	(4,786)
Pension plan termination adjustment	(14,711)	0	0
U.S. tax cost (benefit) of foreign source income	3,488	269	1,783
Other	1,065	3,477	(825)
Total	$ 48,418	$ 57,896	$ 75,410
Effective tax rate	14.90%	21.90%	20.50%
Total income tax payments, net of refunds	$ 87,288	$ 59,360	$ 42,880