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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill, Impairment Loss $ 0 $ 0  
Amortization expense of intangible assets 12,900 $ 13,600 $ 14,300
Future Amortization Expense, 2017 12,200    
Future Amortization Expense, 2018 11,400    
Future Amortization Expense, 2019 10,700    
Future Amortization Expense, 2020 10,100    
Future Amortization Expense, 2021 $ 9,200