Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Acquired Intangible Assets
Accumulated Amortization		$ 142,465	$ 125,825
Intangible Assets, Gross (Excluding Goodwill)		513,180	467,251
Intangible Assets, Net (Excluding Goodwill)		370,715	341,426
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		345,491	319,934
Accumulated Amortization		81,947	69,008
Net Balance		$ 263,544	250,926
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	16 years	16 years
Patents
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 87,622	76,206
Accumulated Amortization		46,707	44,611
Net Balance		$ 40,915	31,595
Patents | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	3 years	3 years
Patents | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	19 years	19 years
Tradenames
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 61,092	50,917
Accumulated Amortization		9,369	7,086
Net Balance		$ 51,723	43,831
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		$ 6,379	7,598
Accumulated Amortization		4,256	4,947
Net Balance		$ 2,123	2,651
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		186	173
Net Balance		$ 123	$ 136
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