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Income Taxes (Schedule Of Additional Information Related To Unrecognized Uncertain Tax Positions) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]        
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax and other noncurrent liability accounts in the balance sheet) $ 910 $ 1,025 $ 1,065 $ 996
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) (212) (219) (234)  
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized 698 806 831  
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $(300), $200 and $(400) reflected in income tax expense in the income statement in 2012, 2011 and 2010, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) 60 373 125  
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement (300) 200 (400)  
Related deferred income tax assets recognized on interest and penalties (23) (141) (46)  
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized 37 232 79  
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized $ 735 $ 1,038 $ 910