Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Acquired Intangible Assets
Accumulated Amortization		$ 178,919	$ 158,616
Intangible Assets, Gross (Excluding Goodwill)		616,317	579,501
Intangible Assets, Net (Excluding Goodwill)		437,398	420,885
Tradenames
Acquired Intangible Assets
Indefinite-Lived Intangible Assets		7,600	7,600
Purchased research and development
Acquired Intangible Assets
Indefinite-Lived Intangible Assets		4,687	4,687
Customer Relationships
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		424,433	398,613
Accumulated Amortization		110,076	95,443
Net Balance		$ 314,357	303,170
Customer Relationships | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	6 years	6 years
Customer Relationships | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	17 years	17 years
Patents
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 96,920	92,128
Accumulated Amortization		49,698	47,090
Net Balance		$ 47,222	45,038
Patents | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	3 years	3 years
Patents | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	20 years	20 years
Tradenames
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 74,889	69,686
Accumulated Amortization		14,240	11,272
Net Balance		$ 60,649	58,414
Tradenames | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	3 years	3 years
Tradenames | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	20 years	20 years
Non-compete Agreements
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 7,479	6,478
Accumulated Amortization		4,702	4,617
Net Balance		$ 2,777	1,861
Non-compete Agreements | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	3 years	3 years
Non-compete Agreements | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	6 years	6 years
Other
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 309	309
Accumulated Amortization		203	194
Net Balance		$ 106	$ 115
Other | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	2 years	2 years
Other | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	12 years	12 years