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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:    
Stock Compensation $ 664 $ 1,011
Other 84 4
Total deferred income tax assets 748 1,015
Deferred income tax liabilities:    
Property and equipment (53,120) (56,132)
Goodwill and other intangible assets (973) (998)
Other (400) (343)
Total deferred income tax liabilities (54,493) (57,473)
Net deferred income tax liabilities $ (53,745) $ (56,458)