Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Acquired Intangible Assets
Finite-Lived Intangible Assets, Accumulated Amortization	$ 60,136		$ 56,802
Indefinite-Lived Intangible Assets - Purchased research and development	4,687		4,687
Intangible Assets, Gross (Excluding Goodwill)	162,998		153,761
Intangible Assets, Net (Excluding Goodwill)	102,862	$ 92,654	96,959
Customer Relationships
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross	90,760		81,260
Finite-Lived Intangible Assets, Accumulated Amortization	28,278		27,553
Finite-Lived Intangible Assets, Net	$ 62,482		$ 53,707
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	$ 54,358		$ 54,333
Finite-Lived Intangible Assets, Accumulated Amortization	25,391		22,389
Finite-Lived Intangible Assets, Net	$ 28,967		$ 31,944
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	$ 8,635		$ 9,173
Finite-Lived Intangible Assets, Accumulated Amortization	4,011		4,525
Finite-Lived Intangible Assets, Net	$ 4,624		$ 4,648
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	$ 4,048		$ 3,948
Finite-Lived Intangible Assets, Accumulated Amortization	2,283		2,233
Finite-Lived Intangible Assets, Net	$ 1,765		$ 1,715
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	$ 510		$ 360
Finite-Lived Intangible Assets, Accumulated Amortization	173		102
Finite-Lived Intangible Assets, Net	$ 337		$ 258
Other | Minimum
Acquired Intangible Assets
Estimated useful life in years	1 year	2 years
Other | Maximum
Acquired Intangible Assets
Estimated useful life in years	12 years	12 years