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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance [1] $ (7,036) $ (1,532) $ (2,667) $ (4,119)
Other comprehensive (loss) income before reclassification [1] (1,446) 349 (5,657) 2,960
Amount reclassified from accumulated other comprehensive loss [1] (10) (86) (168) (110)
Other comprehensive (loss) income [1] (1,456) 263 (5,825) 2,850
Ending balance [1] $ (8,492) $ (1,269) (8,492) $ (1,269)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive (loss) income     $ (5,825)  
[1] All amounts are net of tax. Amounts in parentheses indicate debits.