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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
​ |  | 2021 |  | 2020 |  | 2019
Domestic | ​ | $ | 24,541 | ​ | $ | 17,526 | ​ | $ | (20,597)
Foreign | ​ |  | 124,170 | ​ |  | 140,621 | ​ |  | 87,791
​ | ​ | $ | 148,711 | ​ | $ | 158,147 | ​ | $ | 67,194
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,
​ |  | 2021 |  | 2020 |  | 2019
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | (2,468) | ​ | $ | 5,475 | ​ | $ | (9,627)
State | ​ |  | 929 | ​ |  | 1,927 | ​ |  | 882
Foreign | ​ |  | 14,217 | ​ |  | 16,216 | ​ |  | 18,429
Total current provision | ​ | ​ | 12,678 | ​ | ​ | 23,618 | ​ | ​ | 9,684
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ | ​ | 762 | ​ | ​ | (312) | ​ | ​ | 3,822
State | ​ |  | (200) | ​ |  | 1,270 | ​ |  | (178)
Foreign | ​ |  | 764 | ​ |  | (1,580) | ​ |  | (2,629)
Total deferred provision (benefit) | ​ |  | 1,326 | ​ |  | (622) | ​ |  | 1,015
Total provision for income taxes | ​ | $ | 14,004 | ​ | $ | 22,996 | ​ | $ | 10,699
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2021 |  | 2020 |  | 2019
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
Schedule of deferred tax assets and liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2021 |  | 2020
Deferred tax assets |  | ​ |  |  | ​ |
Stock-based compensation | ​ | $ | 2,528 | ​ | $ | 2,130
Net operating loss and tax credit carryforwards | ​ |  | 54,210 | ​ |  | 57,590
Interest expense limitation | ​ | ​ | 7,344 | ​ | ​ | 7,344
Pension obligation | ​ |  | 10,778 | ​ |  | 14,297
Excess and obsolete inventory | ​ |  | 3,325 | ​ |  | 3,722
Accrued restructuring | ​ | ​ | 2,223 | ​ | ​ | 2,468
Deferred revenue | ​ |  | 4,195 | ​ |  | 3,048
Employee bonuses and commissions | ​ |  | 3,861 | ​ |  | 5,388
Amortization | ​ |  | 26,358 | ​ |  | 28,786
Operating lease liabilities | ​ | ​ | 19,405 | ​ | ​ | 20,267
Other | ​ |  | 8,017 | ​ |  | 8,925
Deferred tax assets | ​ |  | 142,244 | ​ |  | 153,965
Less: Valuation allowance | ​ |  | (42,051) | ​ |  | (46,702)
Net deferred tax assets | ​ |  | 100,193 | ​ |  | 107,263
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities | ​ |  | ​ | ​ |  |
Depreciation and amortization | ​ |  | 37,515 | ​ |  | 40,266
Unremitted earnings | ​ |  | 4,435 | ​ |  | 4,173
Operating lease right-of-use assets | ​ | ​ | 17,558 | ​ | ​ | 18,731
Other | ​ |  | 3,364 | ​ |  | 3,380
Deferred tax liabilities | ​ |  | 62,872 | ​ |  | 66,550
Net deferred tax assets | ​ | $ | 37,321 | ​ | $ | 40,713
Summary of income tax contingencies | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2021 |  | 2020 |  | 2019
Balance at beginning of period | ​ | $ | 9,673 | ​ | $ | 13,009 | ​ | $ | 13,162
Additions based on tax positions taken during a prior period | ​ |  | 963 | ​ |  | 219 | ​ |  | 484
Additions based on tax positions taken during a prior period - acquisitions | ​ |  | — | ​ |  | — | ​ |  | 4,479
Additions based on tax positions taken during the current period | ​ |  | 566 | ​ |  | — | ​ |  | —
Reductions based on tax positions taken during a prior period | ​ |  | — | ​ |  | — | ​ |  | (4,295)
Reductions related to a lapse of applicable statute of limitations | ​ |  | (4,575) | ​ |  | (3,555) | ​ |  | (821)
Reductions related to a settlement with taxing authorities | ​ |  | (1,114) | ​ |  | — | ​ |  | —
Balance at end of period | ​ | $ | 5,513 | ​ | $ | 9,673 | ​ | $ | 13,009

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