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Income Taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Self insurance reserves $ 4,555 $ 6,670
Contract loss reserves 317 257
Stock-based awards 1,571 2,554
Bonus 590 2,908
Non-U.S. operating loss 2,173 595
Non-U.S. deferred income tax assets, net 773 0
Other 1,359 1,652
Total deferred income tax assets before valuation allowances 11,338 14,636
Less: valuation allowances (2,173) (595)
Total deferred income tax assets 9,165 14,041
Deferred income tax liabilities:    
Property and equipment - tax over book depreciation (18,792) (26,664)
Intangible assets - tax over book amortization (2,186) (3,592)
Non-U.S. deferred income tax liabilities 0 (91)
Other (1,639) (2,259)
Total deferred income tax liabilities (22,617) (32,606)
Net deferred income taxes $ (13,452) $ (18,565)