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Income Taxes - Summary of Net Deferred Tax Assets and (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Self insurance reserves | $ 2,138 | $ 4,091
Contract loss reserves | 541 | 703
Stock-based awards | 1,633 | 1,300
Bonus | 8,373 | 6,173
Accrued vacation | 1,977 | 1,741
Accrued profit sharing | 2,665 | 2,476
Operating lease liabilities | 5,404 | 5,715
Non-U.S. operating loss | 2,520 | 3,601
Other | 2,628 | 4,661
Total deferred income tax assets before valuation allowances | 27,879 | 30,461
Less: valuation allowances | (2,593) | (2,566)
Total deferred income tax assets | 25,286 | 27,895
Deferred income tax liabilities: |  |
Property and equipment — tax over book depreciation | (36,856) | (34,439)
Intangible assets — tax over book amortization | (2,913) | (2,207)
Right-of-use operating lease assets | (5,398) | (5,702)
Non-U.S. deferred income tax liabilities | 0 | (1,322)
Contract revenue adjustment | (4,526) | (2,128)
Other | (213) | (436)
Total deferred income tax liabilities | (49,906) | (46,234)
Net deferred income taxes | $ (24,620) | $ (18,339)

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