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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes |
Schedule of components of provision for income tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 5,509 | ​ | $ | 12,492 | ​ | $ | 3,953
State | ​ | ​ | 1,621 | ​ | ​ | 3,067 | ​ | ​ | 1,736
​ | ​ | ​ | 7,130 | ​ | ​ | 15,559 | ​ | ​ | 5,689
Deferred: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | (17,135) | ​ | ​ | (1,442) | ​ | ​ | 5,001
State | ​ | ​ | (2,271) | ​ | ​ | (666) | ​ | ​ | 1,164
​ | ​ | ​ | (19,406) | ​ | ​ | (2,108) | ​ | ​ | 6,165
​ | ​ | $ | (12,276) | ​ | $ | 13,451 | ​ | $ | 11,854
Schedule of reconciliation of income tax expense computed at the federal statutory rate to the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 2020 | ​ | 2019 | ​ | 2018
Federal income tax expense at statutory rate | $ | (20,752) | ​ | $ | 13,150 | ​ | $ | 11,709
State taxes, net of federal benefit | ​ | (2,820) | ​ | ​ | 2,239 | ​ | ​ | 2,349
Valuation allowance | ​ | 1,762 | ​ | ​ | 139 | ​ | ​ | -
Change in uncertain tax positions, net | ​ | 679 | ​ | ​ | (601) | ​ | ​ | (1,292)
Research and development credit | ​ | (536) | ​ | ​ | (404) | ​ | ​ | (226)
State rate change | ​ | 157 | ​ | ​ | (426) | ​ | ​ | 287
Federal deferred rate change | ​ | - | ​ | ​ | - | ​ | ​ | (836)
Goodwill impairment | ​ | 10,038 | ​ | ​ | - | ​ | ​ | -
Other | ​ | (804) | ​ | ​ | (646) | ​ | ​ | (137)
​ | $ | (12,276) | ​ | $ | 13,451 | ​ | $ | 11,854
Schedule of significant components of deferred tax liabilities and assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Allowance for doubtful accounts | ​ | $ | 754 | ​ | $ | 382
Inventory reserves | ​ | ​ | 1,529 | ​ | ​ | 1,388
Warranty liability | ​ | ​ | 1,465 | ​ | ​ | 1,643
Deferred compensation | ​ | ​ | 1,437 | ​ | ​ | 1,380
Earnout liabilities | ​ | ​ | 354 | ​ | ​ | 406
Pension and retiree health benefit obligations | ​ | ​ | 1,738 | ​ | ​ | 1,682
Interest rate swap | ​ | ​ | 3,373 | ​ | ​ | 1,733
Accrued vacation | ​ | ​ | 1,241 | ​ | ​ | 833
Medical claims reserve | ​ | ​ | 84 | ​ | ​ | 56
Operating lease liabilities | ​ | ​ | 5,583 | ​ | ​ | 6,108
Net operating losses | ​ | ​ | 3,744 | ​ | ​ | 3,754
Other accrued liabilities | ​ | ​ | 4,949 | ​ | ​ | 2,953
Valuation allowance | ​ | ​ | (3,374) | ​ | ​ | (1,612)
Total deferred tax assets | ​ | ​ | 22,877 | ​ | ​ | 20,706
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Tax deductible goodwill and other intangibles | ​ | ​ | (35,953) | ​ | ​ | (54,808)
Accelerated depreciation | ​ | ​ | (8,105) | ​ | ​ | (7,320)
Operating leases - right of use assets | ​ | ​ | (5,583) | ​ | ​ | (6,108)
Other | ​ | ​ | 83 | ​ | ​ | 319
Total deferred tax liabilities | ​ | ​ | (49,558) | ​ | ​ | (67,917)
Net deferred tax liabilities | ​ | $ | (26,681) | ​ | $ | (47,211)
Schedule of reconciliation of the beginning and ending liability for uncertain tax positions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019 | ​ | 2018
Balance at beginning of year | ​ | $ | 1,219 | ​ | $ | 1,795 | ​ | $ | 3,531
Increases for tax positions taken in the current year | ​ | ​ | 238 | ​ | ​ | 131 | ​ | ​ | 21
Increases for tax positions taken in the prior years | ​ | ​ | 846 | ​ | ​ | 15 | ​ | ​ | 146
Decreases due to settlements with taxing authorities | ​ | ​ | (83) | ​ | ​ | - | ​ | ​ | (693)
Decreases due to lapses in the statute of limitations | ​ | ​ | (266) | ​ | ​ | (722) | ​ | ​ | (1,210)
Balance at the end of year | ​ | $ | 1,954 | ​ | $ | 1,219 | ​ | $ | 1,795

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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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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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