Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Acquired Intangible Assets
Accumulated Amortization		$ 119,730	$ 104,764
Intangible Assets, Gross (Excluding Goodwill)		297,040	281,106
Intangible Assets, Net (Excluding Goodwill)		177,310	176,342
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		200,497	191,919
Accumulated Amortization		64,747	54,889
Net Balance		$ 135,750	137,030
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		$ 61,546	58,787
Accumulated Amortization		43,247	40,079
Net Balance		$ 18,299	18,708
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		$ 15,209	10,885
Accumulated Amortization		6,652	5,507
Net Balance		$ 8,557	5,378
Tradenames | Minimum
Acquired Intangible Assets
Estimated Useful Life in Years	3 years	3 years
Tradenames | Maximum
Acquired Intangible Assets
Estimated Useful Life in Years	15 years	15 years
Non-compete Agreements
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross		$ 7,193	6,919
Accumulated Amortization		4,919	4,148
Net Balance		$ 2,274	2,771
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		$ 308	309
Accumulated Amortization		165	141
Net Balance		$ 143	$ 168
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