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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)