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Income Taxes - Deferred Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 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)
Valuation allowance | 3,374 | $ 1,612
State |  |
Deferred tax assets: |  |
Valuation allowance | (2,447) |
Deferred tax liabilities: |  |
Operating loss carry forwards | 2,817 |
Valuation allowance | 2,447 |
Non-State |  |
Deferred tax assets: |  |
Valuation allowance | (927) |
Deferred tax liabilities: |  |
Valuation allowance | $ 927 |

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