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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Employee benefits | $ 758 | $ 962
Uncompleted contracts | 2,380 | 2,664
Stock based compensation expense | 266 | 350
Allowance for doubtful accounts | 84 | 99
Long-term incentive awards | 150 | 280
Federal net operating losses | 9,962 | 13,190
State net operating losses | 1,155 | 511
Other | 395 | 394
Total deferred tax assets | 15,150 | 18,450
Deferred tax liabilities |  |
Property, plant and equipment | (10,199) | (17,605)
Prepaid insurance | (450) | (453)
Total deferred tax liabilities | (10,649) | (18,058)
Net deferred tax assets | 4,501 | 392
Valuation allowance | (4,701) | (392)
Net deferred taxes | $ (200) | $ 0

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