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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax benefit |  |  | $ 10,600
Current |  |  |
Federal | $ 7,739 | $ 9,667 | 14,149
State | 1,344 | 1,758 | 2,511
Foreign | 825 | 140 | 0
Current Total | 9,908 | 11,565 | 16,660
Deferred |  |  |
Federal | (66) | (1,114) | (10,645)
State | (490) | (347) | 110
Foreign | 51 | 64 | (136)
Deferred Total | (505) | (1,397) | (10,671)
Provision for income taxes | 9,403 | 10,168 | 5,989
Effective Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory federal income tax rate | 9,749 | 9,502 | 15,780
Increases (decreases) in tax resulting from: |  |  |
State taxes, net of federal tax benefit | 1,805 | 1,861 | 1,732
Permanent differences, net | (195) | 367 | (275)
Impact of Tax Act | 0 | (795) | (10,556)
Tax credits | (612) | (375) | (368)
Prior year true-up adjustment | (1,274) | (113) | (346)
Other provision adjustments | (70) | (279) | 22
Provision for income taxes | 9,403 | 10,168 | $ 5,989
Gross deferred tax assets |  |  |
Deferred compensation and accrued paid leave | 7,498 | 5,794 |
Accrued expenses | 303 | 1,310 |
Stock-based compensation | 678 | 819 |
Interest rate swaps | 367 | 0 |
Reserve for contract disallowances | 145 | 120 |
Acquisition-related expenses | 0 | 151 |
Capitalized inventory | 0 | 742 |
State operating loss carryforward | 24 | 24 |
Tax credit carryforward | 1,547 | 47 |
Foreign country operating loss carryforward | 0 | 157 |
Gross deferred tax assets | 10,562 | 9,164 |
Valuation allowance | (1,165) | (107) |
Total gross deferred tax assets | 9,397 | 9,057 |
Gross deferred tax liabilities |  |  |
Interest rate swaps | 0 | (49) |
Depreciation | (1,877) | (1,739) |
Deferred revenues | (1,681) | (2,164) |
Goodwill and intangible assets | (23,383) | (23,395) |
Prepaid expenses | (60) | (120) |
Capitalized inventory | (240) | 0 |
Total gross deferred tax liabilities | (27,241) | (27,467) |
Net deferred tax liabilities | $ (17,844) | $ (18,410) |

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