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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2020
INCOME TAXES |
Schedule of geographic distribution of pretax income from continuing operations | The geographic distribution of pretax income from continuing operations is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Domestic | ​ | $ | 17,526 | ​ | $ | (20,597) | ​ | $ | 22,325
Foreign | ​ |  | 140,621 | ​ |  | 87,791 | ​ |  | 150,051
​ | ​ | $ | 158,147 | ​ | $ | 67,194 | ​ | $ | 172,376
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,
​ |  | 2020 |  | 2019 |  | 2018
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 5,475 | ​ | $ | (9,627) | ​ | $ | 1,423
State | ​ |  | 1,927 | ​ |  | 882 | ​ |  | 12
Foreign | ​ |  | 16,216 | ​ |  | 18,429 | ​ |  | 13,772
Total current provision | ​ | $ | 23,618 | ​ | $ | 9,684 | ​ | $ | 15,207
Deferred: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ | $ | (312) | ​ | $ | 3,822 | ​ | $ | 4,021
State | ​ |  | 1,270 | ​ |  | (178) | ​ |  | 2,363
Foreign | ​ |  | (1,580) | ​ |  | (2,629) | ​ |  | 3,636
Total deferred provision (benefit) | ​ |  | (622) | ​ |  | 1,015 | ​ |  | 10,020
Total provision for income taxes | ​ | $ | 22,996 | ​ | $ | 10,699 | ​ | $ | 25,227
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
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
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019
Deferred tax assets |  | ​ |  |  | ​ |
Stock-based compensation | ​ | $ | 2,130 | ​ | $ | 1,757
Net operating loss and tax credit carryforwards | ​ |  | 57,590 | ​ |  | 86,879
Interest expense limitation | ​ | ​ | 7,344 | ​ | ​ | 7,620
Pension obligation | ​ |  | 14,297 | ​ |  | 13,473
Excess and obsolete inventory | ​ |  | 3,722 | ​ |  | 3,217
Accrued restructuring | ​ | ​ | 2,468 | ​ | ​ | —
Deferred revenue | ​ |  | 3,048 | ​ |  | 3,305
Employee bonuses and commissions | ​ |  | 5,388 | ​ |  | 2,537
Depreciation and amortization | ​ |  | 28,786 | ​ |  | 29,015
Operating lease liabilities | ​ | ​ | 20,267 | ​ | ​ | 23,451
Other | ​ |  | 8,925 | ​ |  | 9,685
Deferred tax assets | ​ |  | 153,965 | ​ |  | 180,939
Less: Valuation allowance | ​ |  | (46,702) | ​ |  | (76,206)
Net deferred tax assets | ​ |  | 107,263 | ​ |  | 104,733
Deferred tax liabilities | ​ |  |  | ​ |  |
Depreciation and amortization | ​ |  | 40,266 | ​ |  | 41,549
Unremitted earnings | ​ |  | 4,173 | ​ |  | 4,740
Operating lease right-of-use assets | ​ | ​ | 18,731 | ​ | ​ | 22,774
Other | ​ |  | 3,380 | ​ |  | 2,966
Deferred tax liabilities | ​ |  | 66,550 | ​ |  | 72,029
Net deferred tax assets | ​ | $ | 40,713 | ​ | $ | 32,704
Summary of income tax contingencies | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Balance at beginning of period | ​ | $ | 13,009 | ​ | $ | 13,162 | ​ | $ | 15,990
Additions based on tax positions taken during a prior period | ​ |  | 219 | ​ |  | 484 | ​ |  | 94
Additions based on tax positions taken during a prior period – acquisitions | ​ |  | — | ​ |  | 4,479 | ​ |  | 757
Additions based on tax positions taken during the current period | ​ |  | — | ​ |  | — | ​ |  | —
Reductions based on tax positions taken during a prior period | ​ |  | — | ​ |  | (4,295) | ​ |  | (153)
Reductions related to a lapse of applicable statute of limitations | ​ |  | (3,555) | ​ |  | (821) | ​ |  | (3,144)
Reductions related to a settlement with taxing authorities | ​ |  | — | ​ |  | — | ​ |  | (382)
Balance at end of period | ​ | $ | 9,673 | ​ | $ | 13,009 | ​ | $ | 13,162

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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