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INCOME TAXES - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the withholding tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References No definition available. + Details
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