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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax benefit | $ 10,600 |  |
Current |  |  |
Federal | 9,667 | $ 14,149 | $ 13,648
State | 1,758 | 2,511 | 2,379
Foreign | 140 | 0 | 0
Current Total | 11,565 | 16,660 | 16,027
Deferred |  |  |
Federal | (1,114) | (10,645) | (983)
State | (347) | 110 | (163)
Foreign | 64 | (136) | 0
Deferred Total | (1,397) | (10,671) | (1,146)
Provision for income taxes | $ 10,168 | $ 5,989 | $ 14,881
Federal statutory rate | 21.00% | 35.00% | 35.00%
Effective Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory federal income tax rate | $ 9,502 | $ 15,780 | $ 14,586
Increases (decreases) in tax resulting from: |  |  |
State taxes, net of federal tax benefit | 1,861 | 1,732 | 1,599
Permanent differences, net | 367 | (275) | (545)
Impact of Tax Act | (795) | (10,556) | 0
Other provision adjustments | (767) | (692) | (759)
Provision for income taxes | 10,168 | 5,989 | $ 14,881
Gross deferred tax assets |  |  |
Deferred compensation and accrued paid leave | 5,794 | 5,594 |
Accrued expenses | 1,310 | 1,013 |
Stock-based compensation | 819 | 772 |
Reserve for contract disallowances | 120 | 84 |
Acquisition-related expenses | 151 | 0 |
Capitalized inventory | 742 | 916 |
State operating loss carryforward | 24 | 263 |
Tax credit carryforward | 47 | 178 |
Foreign country operating loss carryforward | 157 | 136 |
Foreign country valuation allowance | (107) | 0 |
Total gross deferred tax assets | 9,057 | 8,956 |
Gross deferred tax liabilities |  |  |
Interest rate swaps | (49) | (74) |
Depreciation | (1,739) | (2,439) |
Deferred revenues | (2,164) | (1,875) |
Goodwill and intangible assets | (23,395) | (23,854) |
Prepaid expenses | (120) | 0 |
Total gross deferred tax liabilities | (27,467) | (28,242) |
Net deferred tax liabilities | $ (18,410) | $ (19,286) |

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