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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of income before income taxes by geographical area | Income before income taxes by geographic area was, for the years ended December 31:
(in thousands) |  | 2023 |  | 2022 |  | 2021
Federal |  | $ | 102,014 |  |  | $ | 104,185 |  |  | $ | 106,956 |
Foreign |  | 22,990 |  |  | 10,019 |  |  | 9,350 |
|  | $ | 125,004 |  |  | $ | 114,204 |  |  | $ | 116,306 |
Schedule of income tax expense | Income tax expense consisted of the following for the years ended December 31:
(in thousands) |  | 2023 |  | 2022 |  | 2021
Current |  |  |  |  |  |
Federal |  | $ | 21,337 |  |  | $ | 13,948 |  |  | $ | 16,512 |
Foreign |  | 1,821 |  |  | 2,148 |  |  | 1,947 |
State |  | 7,348 |  |  | 5,154 |  |  | 6,560 |
|  | 30,506 |  |  | 21,250 |  |  | 25,019 |
Deferred |  |  |  |  |  |
Federal |  | (159) |  |  | 7,739 |  |  | 5,061 |
Foreign |  | 3,984 |  |  | 465 |  |  | 287 |
State |  | (317) |  |  | 1,369 |  |  | 933 |
|  | 3,508 |  |  | 9,573 |  |  | 6,281 |
Income tax expense |  | $ | 34,014 |  |  | $ | 30,823 |  |  | $ | 31,300 |
Schedule of effective tax rate reconciliation | The differences between the U.S. federal statutory tax rate and the Company’s effective tax rate for operations were as follows for the years ended December 31:
|  | 2023 |  | 2022 |  | 2021
U.S federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of U.S. federal income tax expense |  | 4.4 |  |  | 4.5 |  |  | 4.7 |
Tax differential on foreign earnings |  | 0.7 |  |  | 0.6 |  |  | 0.5 |
Non-deductible meals and entertainment |  | 0.5 |  |  | 0.2 |  |  | 0.1 |
Stock compensation excess tax benefits |  | (2.6) |  |  | (2.4) |  |  | (0.8) |
Uncertain tax positions |  | — |  |  | 0.1 |  |  | — |
Provision to return adjustments, net |  | 0.7 |  |  | 0.7 |  |  | 0.4 |
Section 162(m) limitation |  | 2.5 |  |  | 2.4 |  |  | 1.1 |
Other income, net |  | — |  |  | (0.1) |  |  | (0.1) |
Effective rate |  | 27.2 | % |  | 27.0 | % |  | 26.9 | %
Schedule of net deferred tax assets and (liabilities) | The net deferred tax assets and (liabilities) arising from temporary differences was as follows at December 31:
(in thousands) |  | 2023 |  | 2022
Deferred income tax assets: |  |  |  |
Self-insurance reserves |  | $ | 3,850 |  |  | $ | 2,979 |
Contract loss reserves |  | 2,273 |  |  | 842 |
Stock-based awards |  | 3,336 |  |  | 2,071 |
Bonus |  | 11,137 |  |  | 8,656 |
Accrued vacation |  | 2,295 |  |  | 2,227 |
Accrued profit sharing |  | 1,707 |  |  | 2,030 |
Operating lease liabilities |  | 8,115 |  |  | 6,691 |
Non-U.S. operating loss |  | 2,411 |  |  | 2,402 |
Other |  | 1,090 |  |  | 1,112 |
Total deferred income tax assets before valuation allowances |  | 36,214 |  |  | 29,010 |
Less: valuation allowances |  | (2,412) |  |  | (2,402) |
Total deferred income tax assets |  | 33,802 |  |  | 26,608 |
Deferred income tax liabilities: |  |  |  |
Property and equipment — tax over book depreciation |  | (45,332) |  |  | (42,413) |
Non-U.S. intangible assets — tax over book amortization |  | (10,363) |  |  | (11,086) |
Intangible assets — tax over book amortization |  | (4,013) |  |  | (3,331) |
Right-of-use operating lease assets |  | (8,115) |  |  | (6,688) |
Non-U.S. deferred income tax liabilities |  | (8,819) |  |  | (4,709) |
Contract revenue adjustment |  | (4,790) |  |  | (4,023) |
Other |  | (600) |  |  | (133) |
Total deferred income tax liabilities |  | (82,032) |  |  | (72,383) |
Net deferred income taxes |  | $ | (48,230) |  |  | $ | (45,775) |
Schedule of liability for unrecognized tax benefits reconciliation | The following is a reconciliation of the beginning and ending liability for unrecognized tax benefits at December 31:
(in thousands) |  | 2023 |  | 2022
Balance at beginning of period |  | $ | 390 |  |  | $ | 328 |
Gross increases in current period tax positions |  | 54 |  |  | 83 |
Reductions in tax positions due to lapse of statutory limitations |  | (27) |  |  | (21) |
Balance at end of period |  | 417 |  |  | 390 |
Accrued interest and penalties at end of period |  | 107 |  |  | 99 |
Total liability for unrecognized tax benefits |  | $ | 524 |  |  | $ | 489 |

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