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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2023
INCOME TAXES |
Schedule of geographic distribution of pretax income from continuing operations | The geographic distribution of pretax income from continuing operations was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2023 |  | 2022 |  | 2021
Domestic | ​ | $ | (17,458) | ​ | $ | 5,969 | ​ | $ | 24,541
Foreign | ​ |  | 139,919 | ​ |  | 235,772 | ​ |  | 124,170
Income from continuing operations, before income taxes | ​ | $ | 122,461 | ​ | $ | 241,741 | ​ | $ | 148,711
Schedule of income tax provision (benefit) from continuing operations | The income tax provision (benefit) from continuing operations is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
​ |  | 2023 |  | 2022 |  | 2021 |
Current: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Federal | ​ | $ | 13,402 | ​ | $ | 23,370 | ​ | $ | (2,468) | ​
State | ​ |  | 589 | ​ |  | 1,949 | ​ |  | 929 | ​
Foreign | ​ |  | 11,661 | ​ |  | 20,267 | ​ |  | 14,217 | ​
Total current provision | ​ | ​ | 25,652 | ​ | ​ | 45,586 | ​ | ​ | 12,678 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ |  |  | ​ |  |  | ​ |  |  | ​
Federal | ​ | ​ | (5,455) | ​ | ​ | (6,742) | ​ | ​ | 762 | ​
State | ​ |  | (955) | ​ |  | (1,030) | ​ |  | (200) | ​
Foreign | ​ |  | (27,530) | ​ |  | 2,036 | ​ |  | 764 | ​
Total deferred provision (benefit) | ​ |  | (33,940) | ​ |  | (5,736) | ​ |  | 1,326 | ​
Total income tax provision (benefit) | ​ | $ | (8,288) | ​ | $ | 39,850 | ​ | $ | 14,004 | ​
Effective tax rate | ​ | ​ | (6.8) | % | ​ | 16.5 | % | ​ | 9.4 | %
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2023 |  | 2022 |  | 2021
Income taxes per federal statutory rate | ​ | $ | 25,850 | ​ | $ | 50,766 | ​ | $ | 31,229
State income taxes, net of federal deduction | ​ | ​ | (490) | ​ | ​ | 510 | ​ | ​ | 534
U.S. tax on foreign operations | ​ | ​ | 20,451 | ​ | ​ | 28,726 | ​ | ​ | 5,786
Foreign derived intangible income deduction | ​ | ​ | (2,868) | ​ | ​ | (6,259) | ​ | ​ | (3,927)
Tax effect of foreign operations | ​ | ​ | (27,959) | ​ | ​ | (28,432) | ​ | ​ | (11,520)
Uncertain tax positions | ​ | ​ | 1,291 | ​ | ​ | 1,080 | ​ | ​ | (6,899)
Audit settlements | ​ | ​ | — | ​ | ​ | 34 | ​ | ​ | 7,764
Change in valuation allowance assessment | ​ | ​ | (25,636) | ​ | ​ | — | ​ | ​ | —
Tax credits | ​ | ​ | (7,289) | ​ | ​ | (5,857) | ​ | ​ | (6,149)
Change in valuation allowance | ​ | ​ | 12,927 | ​ | ​ | 268 | ​ | ​ | (73)
Executive compensation limitation | ​ | ​ | 1,955 | ​ | ​ | 641 | ​ | ​ | 1,926
Other permanent items, net | ​ | ​ | (6,520) | ​ | ​ | (1,627) | ​ | ​ | (4,667)
Total income tax provision (benefit) | ​ | $ | (8,288) | ​ | $ | 39,850 | ​ | $ | 14,004
Schedule of deferred tax assets and liabilities | Deferred tax assets and liabilities are recognized for the future tax consequences of differences between the carrying amounts of assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the differences are expected to be reversed. Significant deferred tax assets and liabilities consist of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2023 |  | 2022
Deferred tax assets |  | ​ |  |  | ​ |
Net operating loss and tax credit carryforwards | ​ | $ | 73,954 | ​ | $ | 47,733
Interest expense limitation | ​ | ​ | 7,282 | ​ | ​ | 7,282
Pension obligation | ​ |  | 9,960 | ​ |  | 7,301
Bond hedge original issue discount | ​ |  | 24,755 | ​ |  | —
Employee bonuses and commissions | ​ |  | 6,654 | ​ |  | 9,276
Depreciation and amortization | ​ |  | 24,787 | ​ |  | 25,879
Operating lease liabilities | ​ | ​ | 12,054 | ​ | ​ | 10,136
Other | ​ |  | 28,099 | ​ |  | 17,102
Total deferred tax assets | ​ |  | 187,545 | ​ |  | 124,709
Less: valuation allowance | ​ |  | (37,999) | ​ |  | (36,046)
Deferred tax assets, net of valuation allowance | ​ |  | 149,546 | ​ |  | 88,663
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities | ​ |  | ​ | ​ |  |
Depreciation and amortization | ​ |  | 32,110 | ​ |  | 35,678
Unremitted earnings | ​ |  | 3,277 | ​ |  | 4,115
Operating lease right-of-use assets | ​ | ​ | 9,520 | ​ | ​ | 8,392
Other | ​ |  | 4,107 | ​ |  | 1,801
Total deferred tax liabilities | ​ |  | 49,014 | ​ |  | 49,986
Net deferred tax assets | ​ | $ | 100,532 | ​ | $ | 38,677
Summary of income tax contingencies | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2023 |  | 2022 |  | 2021
Balance at beginning of period | ​ | $ | 7,467 | ​ | $ | 5,513 | ​ | $ | 9,673
Additions based on tax positions taken during a prior period | ​ |  | 199 | ​ |  | 245 | ​ |  | 963
Additions based on tax positions taken during a prior period - acquisitions | ​ |  | — | ​ |  | 1,025 | ​ |  | —
Additions based on tax positions taken during the current period | ​ |  | 1,070 | ​ |  | 836 | ​ |  | 566
Reductions based on tax positions taken during a prior period | ​ |  | — | ​ |  | — | ​ |  | —
Reductions related to a lapse of applicable statute of limitations | ​ |  | (139) | ​ |  | (152) | ​ |  | (4,575)
Reductions related to a settlement with taxing authorities | ​ |  | (145) | ​ |  | — | ​ |  | (1,114)
Balance at end of period | ​ | $ | 8,452 | ​ | $ | 7,467 | ​ | $ | 5,513

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