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INCOME TAXES - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INCOME TAXES
Income taxes per federal statutory rate	$ 33,211	$ 14,111	$ 36,199
State income taxes, net of federal deduction	2,793	10	2,372
U.S. tax on foreign operations	9,666	5,805	6,943
Foreign derived intangible income deduction	(4,070)		(261)
Tax effect of foreign operations	(20,527)	(13,086)	(19,162)
Uncertain tax position	(3,215)	(4,487)	(3,088)
Unremitted earnings	(567)	1,624	2,564
Tax credits	(2,292)	(2,088)	(1,484)
Change in valuation allowance	(1,175)	7,222	(1,306)
Withholding taxes	4,265	6,500	1,371
Other permanent items, net	4,907	(4,912)	1,079
Total provision for income taxes	$ 22,996	$ 10,699	$ 25,227

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