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Income Taxes - Summary of net deferred tax assets and (liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Self insurance reserves $ 4,299 $ 4,555
Contract loss reserves 350 317
Stock-based awards 1,143 1,571
Bonus 3,271 590
Non-U.S. operating loss 2,672 2,173
Non-U.S. deferred income tax assets, net 1,526 773
Other 1,958 1,359
Total deferred income tax assets before valuation allowances 15,219 11,338
Less: valuation allowances (2,672) (2,173)
Total deferred income tax assets 12,547 9,165
Deferred income tax liabilities:    
Property and equipment – tax over book depreciation (26,030) (18,792)
Intangible assets – tax over book amortization (1,890) (2,186)
Other (2,025) (1,639)
Total deferred income tax liabilities (29,945) (22,617)
Net deferred income taxes $ (17,398) $ (13,452)