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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
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) |  | 2020 |  | 2019 |  | 2018
Federal |  | $ | 77,195 |  |  | $ | 46,445 |  |  | $ | 48,393 |
Foreign |  | 4,190 |  |  | 3,997 |  |  | (5,325) |
|  | $ | 81,385 |  |  | $ | 50,442 |  |  | $ | 43,068 |
Schedule of Income Tax Expense | Income tax expense consisted of the following for the years ended December 31:
(in thousands) |  | 2020 |  | 2019 |  | 2018
Current |  |  |  |  |  |
Federal |  | $ | 19,014 |  |  | $ | 6,976 |  |  | $ | 5,155 |
State |  | 6,363 |  |  | 3,562 |  |  | 3,310 |
|  | 25,377 |  |  | 10,538 |  |  | 8,465 |
Deferred |  |  |  |  |  |
Federal |  | (2,519) |  |  | 3,010 |  |  | 4,936 |
Foreign |  | 963 |  |  | 874 |  |  | (822) |
State |  | (1,195) |  |  | (194) |  |  | (805) |
|  | (2,751) |  |  | 3,690 |  |  | 3,309 |
Income tax expense |  | $ | 22,626 |  |  | $ | 14,228 |  |  | $ | 11,774 |
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:
|  | 2020 |  | 2019 |  | 2018
U.S federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of U.S. federal income tax expense |  | 5.0 |  |  | 4.7 |  |  | 5.2 |
Change in valuation allowance |  | 0.1 |  |  | (0.3) |  |  | 1.2 |
Tax differential on foreign earnings |  | — |  |  | 0.4 |  |  | (0.5) |
Non-deductible meals and entertainment |  | 0.4 |  |  | 0.8 |  |  | 0.8 |
Stock compensation excess tax benefits |  | (0.6) |  |  | 0.1 |  |  | (0.1) |
Uncertain tax positions |  | 0.3 |  |  | (0.4) |  |  | 0.1 |
Provision to return adjustments, net |  | 0.4 |  |  | 0.2 |  |  | (0.2) |
Global intangible low tax income |  | 0.9 |  |  | 0.3 |  |  | — |
Non-controlling interest |  | — |  |  | 0.9 |  |  | (0.5) |
Other income, net |  | 0.3 |  |  | 0.5 |  |  | 0.3 |
Effective rate |  | 27.8 | % |  | 28.2 | % |  | 27.3 | %
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) |  | 2020 |  | 2019
Deferred income tax assets: |  |  |  |
Self insurance reserves |  | $ | 4,091 |  |  | $ | 4,458 |
Contract loss reserves |  | 703 |  |  | 642 |
Stock-based awards |  | 1,300 |  |  | 1,164 |
Bonus |  | 7,554 |  |  | 4,904 |
Operating lease liabilities |  | 5,715 |  |  | 5,850 |
Non-U.S. operating loss |  | 3,601 |  |  | 5,499 |
Other |  | 7,250 |  |  | 3,439 |
Total deferred income tax assets before valuation allowances |  | 30,214 |  |  | 25,956 |
Less: valuation allowances |  | (2,566) |  |  | (2,508) |
Total deferred income tax assets |  | 27,648 |  |  | 23,448 |
Deferred income tax liabilities: |  |  |  |
Property and equipment — tax over book depreciation |  | (34,439) |  |  | (32,220) |
Intangible assets — tax over book amortization |  | (1,960) |  |  | (1,856) |
Right-of-use operating lease assets |  | (5,702) |  |  | (5,850) |
Non-U.S. deferred income tax liabilities |  | (1,322) |  |  | (2,280) |
Other |  | (2,564) |  |  | (2,187) |
Total deferred income tax liabilities |  | (45,987) |  |  | (44,393) |
Net deferred income taxes |  | $ | (18,339) |  |  | $ | (20,945) |
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) |  | 2020 |  | 2019
Balance at beginning of period |  | $ | 152 |  |  | $ | 327 |
Gross increases in current period tax positions |  | 217 |  |  | 31 |
Settlements with taxing authorities |  | — |  |  | (88) |
Reductions in tax positions due to lapse of statutory limitations |  | (16) |  |  | (118) |
Balance at end of period |  | 353 |  |  | 152 |
Accrued interest and penalties at end of period |  | 69 |  |  | 24 |
Total liability for unrecognized tax benefits |  | $ | 422 |  |  | $ | 176 |

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