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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 27,468 | $ 31,943
Prepaid insurance | 766 | 1,209
Total deferred tax liabilities: | 28,234 | 33,152
Deferred tax assets: |  |
Employee benefits | 1,303 | 924
Uncompleted contracts | 106 | 3,321
Stock based compensation expense | 1,488 | 825
Allowance for uncollectible accounts | 192 | 16
Long term incentive awards | 264 | 0
Federal net operating loss | 617 | 5,478
AMT credit carryforwards | 1,030 | 763
Total deferred tax assets: | 5,000 | 11,327
Net deferred tax liabilities: | $ 23,234 | $ 21,825

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