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INCOME TAXES - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
INCOME TAXES |  |  |
Income taxes per federal statutory rate | $ 31,229 | $ 33,211 | $ 14,111
State income taxes, net of federal deduction | 534 | 2,793 | 10
U.S. tax on foreign operations | 5,786 | 9,666 | 5,805
Foreign derived intangible income deduction | (3,927) | (4,070) |
Tax effect of foreign operations | (11,520) | (20,527) | (13,086)
Uncertain tax positions | (6,899) | (3,215) | (4,487)
Audit settlements | 7,764 |  |
Unremitted earnings | 261 | (567) | 1,624
Tax credits | (6,149) | (2,292) | (2,088)
Change in valuation allowance | (73) | (1,175) | 7,222
Withholding taxes | 756 | 4,265 | 6,500
Executive compensation limitation | 1,926 | 1,070 | 356
Other permanent items, net | (5,684) | 3,837 | (5,268)
Total provision for income taxes | $ 14,004 | $ 22,996 | $ 10,699

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