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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred income tax assets:    
Net operating loss carryover $ 1,117 $ 6,828
Other 1,459 1,218
Total deferred income tax assets 2,576 8,046
Deferred income tax liabilities:    
Property and equipment (45,242) (43,716)
Goodwill and other intangible assets (1,075) (1,099)
Other 0 0
Total deferred income tax liabilities (46,317) (44,815)
Net deferred income tax liabilities $ (43,741) $ (36,769)