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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Components of Provision for Income Taxes | The components of the provision for income taxes from continuing operations for the years ended December 31, 2020, 2019 and 2018 are as follows (in thousands):
| 2020 |  | 2019 |  | 2018
Current |  |  |  |  |
Federal | $ | 4,086 |  |  | $ | 7,739 |  |  | $ | 9,667 |
State | 1,262 |  |  | 1,344 |  |  | 1,758 |
Foreign | 144 |  |  | 825 |  |  | 140 |
| 5,492 |  |  | 9,908 |  |  | 11,565 |
Deferred |  |  |  |  |
Federal | (78) |  |  | (66) |  |  | (1,114) |
State | 163 |  |  | (490) |  |  | (347) |
Foreign | 21 |  |  | 51 |  |  | 64 |
| 106 |  |  | (505) |  |  | (1,397) |
Provision for income taxes | $ | 5,598 |  |  | $ | 9,403 |  |  | $ | 10,168 |
Effective Income Tax Reconciliation | The differences between the amount of tax computed at the federal statutory rate of 21% in 2020, 2019 and 2018, and the provision for income taxes from continuing operations for the years ended December 31, 2020, 2019 and 2018 are as follows (in thousands):
| 2020 |  | 2019 |  | 2018
Tax at statutory federal income tax rate | $ | 89 |  |  | $ | 9,749 |  |  | $ | 9,502 |
Increases (decreases) in tax resulting from: |  |  |  |  |
State taxes, net of federal tax benefit | (52) |  |  | 1,805 |  |  | 1,861 |
Permanent differences, net | (1,406) |  |  | (195) |  |  | 367 |
Impact of Tax Act | — |  |  | — |  |  | (795) |
Tax credits | (195) |  |  | (612) |  |  | (375) |
Prior year true-up adjustment | 397 |  |  | (1,274) |  |  | (113) |
Valuation allowance | 6,716 |  |  | (137) |  |  | 107 |
Other provision adjustments | 49 |  |  | 67 |  |  | (386) |
Provision for income taxes | $ | 5,598 |  |  | $ | 9,403 |  |  | $ | 10,168 |
Certain amounts from the prior years have been reclassified to conform to the current year presentation.
Deferred Tax Assets and Liabilities | The tax effect of temporary differences representing deferred tax assets and liabilities as of December 31, 2020 and 2019 are as follows (in thousands):
| 2020 |  | 2019
Gross deferred tax assets |  |  |
Deferred compensation and accrued paid leave | $ | 6,302 |  |  | $ | 7,498 |
Operating lease liabilities | 6,984 |  |  | 7,009 |
Stock-based compensation | 605 |  |  | 678 |
Interest rate swaps | 400 |  |  | 367 |
Reserve for contract disallowance | 195 |  |  | 145 |
Capitalized inventory | 573 |  |  | — |
US operating and capital loss carryforward | 5,989 |  |  | 24 |
Tax credit carryforward | 1,412 |  |  | 1,547 |
Foreign country operating loss carryforward | 583 |  |  | — |
| 23,043 |  |  | 17,268 |
Valuation allowance (a) | (7,926) |  |  | (1,165) |
Total gross deferred tax assets | 15,117 |  |  | 16,103 |
Gross deferred tax liabilities |  |  |
Depreciation | (3,061) |  |  | (2,498) |
Deferred revenues | (1,816) |  |  | (1,681) |
Goodwill and intangible assets | (19,470) |  |  | (23,383) |
Operating lease right-of-use assets | (5,384) |  |  | (5,323) |
Capitalized inventory | — |  |  | (240) |
Other | (283) |  |  | (823) |
Total gross deferred tax liabilities | (30,014) |  |  | (33,948) |
Net deferred tax liabilities | $ | (14,897) |  |  | $ | (17,845) |
(a) A valuation allowance was provided against US capital loss in connection with the stock sale of Prime Turbines, certain state tax credit and foreign tax loss deferred tax assets arising from carryforwards of unused tax benefits. (b) Certain amounts from prior year have been reclassified to conform with current year presentation.

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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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