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Income Taxes (Schedule Of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred Tax Liabilities, Net, Classification [Abstract] |  |
Gross assets | $ 2,012 | $ 1,151
Gross liabilities | 0 | (1)
Current deferred income tax assets and liabilities | 2,012 | 1,150
Valuation allowance | 0 | 0
Current deferred income taxes | 2,012 | 1,150
Gross assets | 63,129 | 63,374
Gross liabilities | (149,708) | (148,540)
Long term deferred income tax assets and liabilities | (86,579) | (85,166)
Valuation allowance | (6,879) | (8,585)
Long term deferred income taxes | (93,458) | (93,751)
Net deferred income tax liability | $ (91,446) | $ (92,601)

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