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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)

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