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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]        
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax and other noncurrent liability accounts in the balance sheet) $ 2,239 $ 910 $ 1,025 $ 1,065
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) (540) (212) (219)  
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized 1,699 698 806  
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $100, $(300) and $200 reflected in income tax expense in the income statement in 2013, 2012 and 2011, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) 156 60 373  
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement 100 (300) 200  
Related deferred income tax assets recognized on interest and penalties (60) (23) (141)  
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized 96 37 232  
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized $ 1,795 $ 735 $ 1,038