Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 2,700	$ 2,800	$ 8,200	$ 8,700
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year	2,600		2,600
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