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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization expense of intangible assets $ 2,700 $ 2,900 $ 5,500 $ 5,800  
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year 5,300   5,300    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 10,100   10,100    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 9,200   9,200    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 8,000   8,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 7,300   7,300    
Goodwill $ 171,117   $ 171,117   $ 171,117