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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)

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