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Income Taxes (Summary Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets    
Property costs and asset retirement obligations $ 2,666 $ 2,157
Employee benefits 9,647 9,712
Other deferred tax assets 7,297 8,995
Total gross deferred tax assets 19,610 20,864
Less valuation allowance 0 0
Net deferred tax assets 19,610 20,864
Deferred tax liabilities    
Accumulated depreciation and amortization (157,322) (133,535)
State deferred taxes (17,042) (16,855)
Other deferred tax liabilities (8,211) (8,837)
Total gross deferred tax liabilities (182,575) (159,227)
Net deferred tax liabilities $ (162,965) $ (138,363)