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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Taxes |
Schedule of components of provision for income tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 4,246 | ​ | $ | 5,509 | ​ | $ | 12,492
State | ​ | ​ | (1,967) | ​ | ​ | 1,621 | ​ | ​ | 3,067
​ | ​ | ​ | 2,279 | ​ | ​ | 7,130 | ​ | ​ | 15,559
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | 1,874 | ​ | ​ | (17,135) | ​ | ​ | (1,442)
State | ​ | ​ | (256) | ​ | ​ | (2,271) | ​ | ​ | (666)
​ | ​ | ​ | 1,618 | ​ | ​ | (19,406) | ​ | ​ | (2,108)
​ | ​ | $ | 3,897 | ​ | $ | (12,276) | ​ | $ | 13,451
Schedule of reconciliation of income tax expense computed at the federal statutory rate to the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 2021 | ​ | 2020 | ​ | 2019
Federal income tax expense at statutory rate | $ | 7,264 | ​ | $ | (20,752) | ​ | $ | 13,150
State taxes, net of federal benefit | ​ | (1,329) | ​ | ​ | (2,820) | ​ | ​ | 2,239
Valuation allowance | ​ | (101) | ​ | ​ | 1,762 | ​ | ​ | 139
Change in uncertain tax positions, net | ​ | (705) | ​ | ​ | 679 | ​ | ​ | (601)
Research and development credit | ​ | (859) | ​ | ​ | (536) | ​ | ​ | (404)
State rate change | ​ | (652) | ​ | ​ | 157 | ​ | ​ | (426)
Goodwill impairment | ​ | - | ​ | ​ | 10,038 | ​ | ​ | -
Other | ​ | 279 | ​ | ​ | (804) | ​ | ​ | (646)
​ | $ | 3,897 | ​ | $ | (12,276) | ​ | $ | 13,451
Schedule of significant components of deferred tax liabilities and assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | $ | 756 | ​ | $ | 754
Inventory reserves | ​ | ​ | 1,505 | ​ | ​ | 1,529
Warranty liability | ​ | ​ | 1,551 | ​ | ​ | 1,465
Deferred compensation | ​ | ​ | 1,659 | ​ | ​ | 1,437
Earnout liabilities | ​ | ​ | 297 | ​ | ​ | 354
Pension and retiree health benefit obligations | ​ | ​ | 1,573 | ​ | ​ | 1,738
Interest rate swap | ​ | ​ | 1,615 | ​ | ​ | 3,373
Accrued vacation | ​ | ​ | 1,440 | ​ | ​ | 1,241
Medical claims reserve | ​ | ​ | 48 | ​ | ​ | 84
Operating lease liabilities | ​ | ​ | 5,011 | ​ | ​ | 5,583
Net operating losses | ​ | ​ | 3,182 | ​ | ​ | 3,744
Other accrued liabilities | ​ | ​ | 5,106 | ​ | ​ | 4,949
Other | ​ | ​ | 663 | ​ | ​ | -
Valuation allowance | ​ | ​ | (3,273) | ​ | ​ | (3,374)
Total deferred tax assets | ​ | ​ | 21,133 | ​ | ​ | 22,877
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Tax deductible goodwill and other intangibles | ​ | ​ | (35,609) | ​ | ​ | (35,953)
Accelerated depreciation | ​ | ​ | (9,918) | ​ | ​ | (8,105)
Operating leases - right of use assets | ​ | ​ | (4,626) | ​ | ​ | (5,583)
Other | ​ | ​ | (769) | ​ | ​ | 83
Total deferred tax liabilities | ​ | ​ | (50,922) | ​ | ​ | (49,558)
Net deferred tax liabilities | ​ | $ | (29,789) | ​ | $ | (26,681)
Schedule of reconciliation of the beginning and ending liability for uncertain tax positions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2019
Balance at beginning of year | ​ | $ | 1,954 | ​ | $ | 1,219 | ​ | $ | 1,795
Increases for tax positions taken in the current year | ​ | ​ | 311 | ​ | ​ | 238 | ​ | ​ | 131
Increases for tax positions taken in the prior years | ​ | ​ | 0 | ​ | ​ | 846 | ​ | ​ | 15
Decreases due to settlements with taxing authorities | ​ | ​ | (991) | ​ | ​ | (83) | ​ | ​ | -
Decreases due to lapses in the statute of limitations | ​ | ​ | (60) | ​ | ​ | (266) | ​ | ​ | (722)
Balance at the end of year | ​ | $ | 1,214 | ​ | $ | 1,954 | ​ | $ | 1,219

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