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Income Taxes - Summary of Net Deferred Tax Assets and (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 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)