INCOME TAXES (TAX RATE RECONCILIATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective tax rate reconciliation
Income tax per U.S. federal statutory rate (21%, 21%, 21%)									$ 35,756	$ 23,186	$ 11,810
State income taxes, net of federal deduction									6,923	3,144	2,003
Change in valuation allowances									3,903	9,832	2,191
Foreign income taxes at different rates than the U.S.									(783)	(3,356)	(3,758)
Foreign withholding taxes									106	600	785
Losses in international markets without tax benefits									(1,656)	(2,651)	(68)
Nondeductible compensation under Section 162(m)									656	668	615
Liabilities for uncertain tax positions									2,882	661	1,105
Permanent difference related to foreign exchange gains									(71)	36	136
(Income)/losses of foreign branch operations									(10)	55	475
Non-taxable earnings of minority interest									(1,964)	(1,294)	(594)
Foreign dividend less foreign tax credits									(1,723)	(1,681)	(1,748)
Decrease (increase) to deferred tax asset - change in state tax rate					$ 2,800				(48)	(2,848)	(1,944)
State and federal income tax credits and NOLs									(3,918)	(1,176)	19
Foreign earnings taxed currently in U.S.									1,936	2,172	3,976
Taxes related to prior year filings									(1,718)	(1,643)	(1,659)
Tax related to acquisition accounting									1,317	978	2,110
Other									(651)	(1,006)	1,029
Income Tax Expense (Benefit), Total	$ 11,284	$ 8,415	$ 11,039	$ 10,199	$ 5,670	$ 5,196	$ 7,345	$ 7,466	$ 40,937	$ 25,677	$ 16,483
Effective income tax rate									24.00%	23.30%	29.30%