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Accumulated Other Comprehensive Income (Loss) (Summary Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [1] $ (2,667) $ (4,119)
Other comprehensive (loss) income before reclassification [1] (3,548) 806
Amount reclassified from accumulated other comprehensive loss [1] (112) (4)
Other comprehensive (loss) income [1] (3,660) 802
Ending balance [1] (6,327) $ (3,317)
Accumulated Other Comprehensive (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive (loss) income $ (3,660)  
[1] All amounts are net of tax. Amounts in parentheses indicate debits.