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Income Taxes - Summary of Net Deferred Tax Assets and (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 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)