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Income Taxes (Schedule Of Additional Information Related To Unrecognized Uncertain Tax Positions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
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) $ 3,315 $ 4,049 $ 3,255 $ 2,239
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) (345) (858) (726)  
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized 2,970 3,191 2,529  
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $(262), $90 and $150 reflected in income tax expense in the income statement in 2016, 2015 and 2014, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) 135 397 310  
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement (262) 90 150  
Related deferred income tax assets recognized on interest and penalties (49) (148) (116)  
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized 86 249 194  
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized $ 3,056 $ 3,440 $ 2,723