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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 17,605 | $ 27,468
Prepaid insurance | 453 | 766
Total deferred tax liabilities: | 18,058 | 28,234
Deferred tax assets: |  |
Employee benefits | 962 | 1,303
Uncompleted contracts | 2,664 | 106
Stock based compensation expense | 350 | 1,488
Allowance for uncollectible accounts | 99 | 192
Long term incentive awards | 280 | 264
Federal net operating losses | 13,190 | 617
State net operating losses | 511 | 0
AMT credit carryforwards | 0 | 1,030
Other | 394 | 0
Less valuation allowance | (392) | 0
Total deferred tax assets: | 18,058 | 5,000
Net deferred tax liabilities: | $ 0 | $ 23,234

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