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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2022
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,
​ |  | 2022 |  | 2021 |  | 2020
Domestic | ​ | $ | 5,969 | ​ | $ | 24,541 | ​ | $ | 17,526
Foreign | ​ |  | 235,772 | ​ |  | 124,170 | ​ |  | 140,621
Income from continuing operations, before income taxes | ​ | $ | 241,741 | ​ | $ | 148,711 | ​ | $ | 158,147
​
Schedule of tax expense and the effective tax rate for income from continuing operations | The provision for income taxes from continuing operations is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 23,370 | ​ | $ | (2,468) | ​ | $ | 5,475
State | ​ |  | 1,949 | ​ |  | 929 | ​ |  | 1,927
Foreign | ​ |  | 20,267 | ​ |  | 14,217 | ​ |  | 16,216
Total current provision | ​ | ​ | 45,586 | ​ | ​ | 12,678 | ​ | ​ | 23,618
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ | ​ | (6,742) | ​ | ​ | 762 | ​ | ​ | (312)
State | ​ |  | (1,030) | ​ |  | (200) | ​ |  | 1,270
Foreign | ​ |  | 2,036 | ​ |  | 764 | ​ |  | (1,580)
Total deferred provision (benefit) | ​ |  | (5,736) | ​ |  | 1,326 | ​ |  | (622)
Total provision for income taxes | ​ | $ | 39,850 | ​ | $ | 14,004 | ​ | $ | 22,996
​
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
Income taxes per federal statutory rate | ​ | $ | 50,766 | ​ | $ | 31,229 | ​ | $ | 33,211
State income taxes, net of federal deduction | ​ | ​ | 510 | ​ | ​ | 534 | ​ | ​ | 2,793
U.S. tax on foreign operations | ​ | ​ | 28,726 | ​ | ​ | 5,786 | ​ | ​ | 9,666
Foreign derived intangible income deduction | ​ | ​ | (6,259) | ​ | ​ | (3,927) | ​ | ​ | (4,070)
Tax effect of foreign operations | ​ | ​ | (28,432) | ​ | ​ | (11,520) | ​ | ​ | (20,527)
Uncertain tax positions | ​ | ​ | 1,080 | ​ | ​ | (6,899) | ​ | ​ | (3,215)
Audit settlements | ​ | ​ | 34 | ​ | ​ | 7,764 | ​ | ​ | —
Unremitted earnings | ​ | ​ | — | ​ | ​ | 261 | ​ | ​ | (567)
Tax credits | ​ | ​ | (5,857) | ​ | ​ | (6,149) | ​ | ​ | (2,292)
Change in valuation allowance | ​ | ​ | — | ​ | ​ | (73) | ​ | ​ | (1,175)
Withholding taxes | ​ | ​ | 413 | ​ | ​ | 756 | ​ | ​ | 4,265
Executive compensation limitation | ​ | ​ | 641 | ​ | ​ | 1,926 | ​ | ​ | 1,070
Other permanent items, net | ​ | ​ | (1,772) | ​ | ​ | (5,684) | ​ | ​ | 3,837
Total provision for income taxes | ​ | $ | 39,850 | ​ | $ | 14,004 | ​ | $ | 22,996
​
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,
​ |  | 2022 |  | 2021
Deferred tax assets |  | ​ |  |  | ​ |
Net operating loss and tax credit carryforwards | ​ | $ | 47,733 | ​ | $ | 54,210
Interest expense limitation | ​ | ​ | 7,282 | ​ | ​ | 7,344
Pension obligation | ​ |  | 7,301 | ​ |  | 10,778
Employee bonuses and commissions | ​ |  | 9,276 | ​ |  | 3,861
Depreciation and amortization | ​ |  | 25,879 | ​ |  | 26,358
Operating lease liabilities | ​ | ​ | 10,136 | ​ | ​ | 19,405
Other | ​ |  | 17,102 | ​ |  | 20,288
Deferred tax assets | ​ |  | 124,709 | ​ |  | 142,244
Less: Valuation allowance | ​ |  | (36,046) | ​ |  | (42,051)
Net deferred tax assets | ​ |  | 88,663 | ​ |  | 100,193
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities | ​ |  | ​ | ​ |  |
Depreciation and amortization | ​ |  | 35,678 | ​ |  | 37,515
Unremitted earnings | ​ |  | 4,115 | ​ |  | 4,435
Operating lease right-of-use assets | ​ | ​ | 8,392 | ​ | ​ | 17,558
Other | ​ |  | 1,801 | ​ |  | 3,364
Deferred tax liabilities | ​ |  | 49,986 | ​ |  | 62,872
Net deferred tax assets | ​ | $ | 38,677 | ​ | $ | 37,321
​
Summary of income tax contingencies | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
Balance at beginning of period | ​ | $ | 5,513 | ​ | $ | 9,673 | ​ | $ | 13,009
Additions based on tax positions taken during a prior period | ​ |  | 245 | ​ |  | 963 | ​ |  | 219
Additions based on tax positions taken during a prior period - acquisitions | ​ |  | 1,025 | ​ |  | — | ​ |  | —
Additions based on tax positions taken during the current period | ​ |  | 836 | ​ |  | 566 | ​ |  | —
Reductions based on tax positions taken during a prior period | ​ |  | — | ​ |  | — | ​ |  | —
Reductions related to a lapse of applicable statute of limitations | ​ |  | (152) | ​ |  | (4,575) | ​ |  | (3,555)
Reductions related to a settlement with taxing authorities | ​ |  | — | ​ |  | (1,114) | ​ |  | —
Balance at end of period | ​ | $ | 7,467 | ​ | $ | 5,513 | ​ | $ | 9,673
​

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