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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | For the years ended December 31, 2023, 2022 and 2021, income before income taxes is broken out between U.S. and foreign-sourced operations consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Domestic | ​ | $ | 60,935 | ​ | $ | 77,562 | ​ | $ | 21,328
Foreign | ​ |  | 51,154 | ​ |  | 5,067 | ​ |  | 32,589
Total | ​ | $ | 112,089 | ​ | $ | 82,629 | ​ | $ | 53,917
Schedule of Components of Income Tax Expense (Benefit) | The components of the provision for income taxes for the years ended December 31, 2023, 2022 and 2021, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Current expense: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 15,684 | ​ | $ | 9,584 | ​ | $ | 808
State | ​ |  | 3,775 | ​ |  | 3,162 | ​ |  | 806
Foreign | ​ |  | 10,862 | ​ |  | 10,291 | ​ |  | 8,480
Total current expense | ​ |  | 30,321 | ​ |  | 23,037 | ​ |  | 10,094
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred expense (benefit): | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | (11,030) | ​ |  | (10,438) | ​ |  | (468)
State | ​ |  | (1,699) | ​ |  | (3,615) | ​ |  | (1,845)
Foreign | ​ |  | 86 | ​ |  | (871) | ​ |  | (2,318)
Total deferred benefit | ​ |  | (12,643) | ​ |  | (14,924) | ​ |  | (4,631)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total income tax expense | ​ | $ | 17,678 | ​ | $ | 8,113 | ​ | $ | 5,463
Schedule of Effective Income Tax Rate Reconciliation | The difference between the income tax expense reported and amounts computed by applying the statutory federal rate of 21.0% to pretax income for the years ended December 31, 2023, 2022 and 2021, consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Computed federal income tax expense at applicable statutory rate of 21% | ​ | $ | 23,539 | ​ | $ | 17,352 | ​ | $ | 11,323
State income tax expense (benefit) | ​ |  | 1,627 | ​ |  | 35 | ​ |  | (283)
Tax credits | ​ |  | (2,412) | ​ |  | (1,978) | ​ |  | (2,507)
Tax effect of international items | ​ |  | (3,994) | ​ |  | (10,698) | ​ |  | (281)
Uncertain tax positions | ​ |  | 4 | ​ |  | (47) | ​ |  | 401
Deferred compensation insurance assets | ​ |  | (548) | ​ |  | 706 | ​ |  | (413)
Stock-based compensation | ​ |  | (3,001) | ​ |  | (3,423) | ​ |  | (5,571)
Valuation allowance | ​ | ​ | (90) | ​ | ​ | 3,523 | ​ | ​ | —
Remeasurement of state deferred taxes | ​ | ​ | (73) | ​ | ​ | (375) | ​ | ​ | (526)
Non-deductible expenses | ​ | ​ | 2,101 | ​ | ​ | 2,027 | ​ | ​ | 2,455
Remeasurement of contingent consideration liabilities | ​ | ​ | 317 | ​ | ​ | 1,061 | ​ | ​ | 733
Other — including the effect of graduated rates | ​ |  | 208 | ​ |  | (70) | ​ |  | 132
Total income tax expense | ​ | $ | 17,678 | ​ | $ | 8,113 | ​ | $ | 5,463
​
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax assets and liabilities at December 31, 2023 and 2022, consisted of the following temporary differences and carry-forward items (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Deferred income tax assets: |  | ​ |  |  | ​ |
Allowance for credit losses on trade receivables | ​ | $ | 2,009 | ​ | $ | 1,925
Accrued compensation expense | ​ |  | 10,285 | ​ |  | 9,968
Inventory differences | ​ |  | 5,477 | ​ |  | 5,712
Net operating loss carryforwards | ​ |  | 10,007 | ​ |  | 11,117
Stock-based compensation expense | ​ |  | 7,913 | ​ |  | 7,167
Operating lease assets | ​ | ​ | 11,331 | ​ | ​ | 12,801
Federal R&D tax credit | ​ | ​ | — | ​ | ​ | 634
State R&D tax credits | ​ | ​ | 5,237 | ​ | ​ | 4,679
IRC Section 174 capitalized R&D | ​ | ​ | 26,370 | ​ | ​ | 15,012
Other | ​ |  | 10,159 | ​ |  | 8,827
Total deferred income tax assets | ​ |  | 88,788 | ​ |  | 77,842
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred income tax liabilities: | ​ |  |  | ​ |  |
Prepaid expenses | ​ |  | (1,123) | ​ |  | (1,568)
Property and equipment | ​ |  | (23,539) | ​ |  | (20,925)
Intangible assets | ​ |  | (34,613) | ​ |  | (38,547)
Foreign withholding tax | ​ |  | (2,005) | ​ |  | (1,571)
Operating lease liabilities | ​ | ​ | (10,129) | ​ | ​ | (11,527)
Other | ​ |  | (1,898) | ​ |  | (2,040)
Total deferred income tax liabilities | ​ |  | (73,307) | ​ |  | (76,178)
Valuation allowance | ​ |  | (13,740) | ​ |  | (13,527)
Net deferred income tax assets (liabilities) | ​ | $ | 1,741 | ​ | $ | (11,863)
​ | ​ | ​ | ​ | ​ | ​ | ​
Reported as: | ​ |  |  | ​ |  |
Deferred income tax assets | ​ | $ | 7,288 | ​ | $ | 6,599
Deferred income tax liabilities | ​ |  | (5,547) | ​ |  | (18,462)
Net deferred income tax assets (liabilities) | ​ | $ | 1,741 | ​ | $ | (11,863)
​
Summary of Income Tax Contingencies | A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax benefits for the years ended December 31, 2023, 2022 and 2021, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Unrecognized tax benefits, opening balance | ​ | $ | 1,576 | ​ | $ | 1,635 | ​ | $ | 1,674
Gross increases (decreases) in tax positions taken in a prior year | ​ |  | 112 | ​ |  | (10) | ​ |  | 82
Gross increases in tax positions taken in the current year | ​ |  | 442 | ​ |  | 294 | ​ |  | 316
Lapse of applicable statute of limitations | ​ |  | (508) | ​ |  | (343) | ​ |  | (437)
Unrecognized tax benefits, ending balance | ​ | $ | 1,622 | ​ | $ | 1,576 | ​ | $ | 1,635

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