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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Gross unrecognized tax benefits on uncertain tax positions (reflected in current income tax, other noncurrent liability accounts, or deferred tax assets in the balance sheet) $ 3,361 $ 1,962 $ 3,315 $ 4,049
Deferred income tax assets related to unrecognized tax benefits on uncertain tax positions (reflected in deferred income tax accounts in the balance sheet) (211) (153) (345)  
Net unrecognized tax benefits on uncertain tax positions, which would impact the effective tax rate if recognized 3,150 1,809 2,970  
Interest and penalties accrued on deductions taken relating to uncertain tax positions (approximately $107, $(1) and $(262) reflected in income tax expense in the income statement in 2018, 2017 and 2016, respectively, with the balance shown in current income tax and other noncurrent liability accounts in the balance sheet) 243 136 135  
Interest and penalties accrued on deductions taken relating to uncertain tax positions, reflected in income tax expense in the income statement 107 (1) (262)  
Related deferred income tax assets recognized on interest and penalties (56) (32) (49)  
Interest and penalties accrued on uncertain tax positions net of related deferred income tax benefits, which would impact the effective tax rate if recognized 187 104 86  
Total net unrecognized tax benefits on uncertain tax positions reflected in the balance sheet, which would impact the effective tax rate if recognized $ 3,337 $ 1,913 $ 3,056