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INCOME TAXES - Effective tax rate - (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective income tax rate differs from the statutory rate |  |  |
U.S. statutory rate (as a percent) | 21.00% | 21.00% | 21.00%
State income taxes, net (as a percent) | 3.70% | 2.30% | 2.40%
Foreign income tax rates (as a percent) | 0.30% | 1.00% | 0.20%
Income tax credits and adjustments (as a percent) | (0.60%) | (0.80%) | (0.60%)
Adjustment of deferred tax balances (as a percent) | (0.20%) | (0.70%) | 0.60%
Reserve for uncertain tax benefits (as a percent) | (0.20%) | 0.30% |
Other, net (as a percent) | (0.60%) | (0.40%) | 0.20%
Effective income tax rate (as a percent) | 23.40% | 22.70% | 23.80%
Unrecognized tax benefits | $ 2,313 | $ 3,392 | $ 3,133
Portion of unrecognized tax benefits that, if recognized, would favorably affect annual effective income tax rate | 1,736 | 1,734 |
Interest and penalties included in liability for uncertain tax positions | 463 | 355 |
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Unrecognized tax benefits at the beginning of the period | 3,392 | 3,133 | 3,011
Increases in tax positions for the current year | 510 | 393 | 700
Reductions in tax positions for lapse of statute of limitations | (1,589) | (134) | (578)
Unrecognized tax benefits at the end of the period | 2,313 | 3,392 | $ 3,133
Foreign Tax Authority |  |  |
Effective income tax rate differs from the statutory rate |  |  |
Foreign subsidiary valuation allowances for net operating loss carryforwards | 5,012 | 4,650 |
State tax credit carryforwards valuation allowances | 1,349 | 1,053 |
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits |  |  |
Foreign subsidiary valuation allowances for net operating loss carryforwards | 5,012 | 4,650 |
State tax credit carryforwards valuation allowances | $ 1,349 | $ 1,053 |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits and would include reversals of such credits. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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