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Income Taxes - Summary of Net Deferred Tax Assets and (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Self-insurance reserves $ 2,979 $ 2,138
Contract loss reserves 842 541
Stock-based awards 2,071 1,633
Bonus 8,656 8,373
Accrued vacation 2,227 1,977
Accrued profit sharing 2,030 2,665
Operating lease liabilities 6,691 5,404
Non-U.S. operating loss 2,402 2,520
Other 1,112 2,628
Total deferred income tax assets before valuation allowances 29,010 27,879
Less: valuation allowances (2,402) (2,593)
Total deferred income tax assets 26,608 25,286
Deferred income tax liabilities:    
Property and equipment — tax over book depreciation (42,413) (36,856)
Non-U.S. intangible assets — tax over book amortization (11,086) 0
Intangible assets — tax over book amortization (3,331) (2,913)
Right-of-use operating lease assets (6,688) (5,398)
Non-U.S. deferred income tax liabilities (4,709) 0
Contract revenue adjustment (4,023) (4,526)
Other (133) (213)
Total deferred income tax liabilities (72,383) (49,906)
Net deferred income taxes $ (45,775) $ (24,620)