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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Stock Compensation | $ 843 | $ 664
Other | 201 | 84
Total deferred income tax assets | 1,044 | 748
Deferred income tax liabilities: |  |
Property and equipment | (32,377) | (53,120)
Goodwill and other intangible assets | (604) | (973)
Other | (226) | (400)
Total deferred income tax liabilities | (33,207) | (54,493)
Net deferred income tax liabilities | $ (32,163) | $ (53,745)

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