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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Intangible Assets
Finite-Lived Intangible Assets, Accumulated Amortization	56,802	48,646
Finite-Lived Intangible Assets, Net	12,704us-gaap_FiniteLivedIntangibleAssetsNet	10,008us-gaap_FiniteLivedIntangibleAssetsNet	11,252us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-Lived Intangible Assets - Purchased research and development	4,687	4,457
Intangible Assets, Gross (Excluding Goodwill)	153,761	108,038
Intangible Assets, Net (Excluding Goodwill)	96,959	59,392
Customer Relationships
Acquired Intangible Assets
Finite-Lived Intangible Assets, Gross	81,260	50,105
Finite-Lived Intangible Assets, Accumulated Amortization	27,553	21,999
Finite-Lived Intangible Assets, Net	53,707	28,106
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	54,333	41,651
Finite-Lived Intangible Assets, Accumulated Amortization	22,389	18,461
Finite-Lived Intangible Assets, Net	31,944	23,190
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	9,173	7,959
Finite-Lived Intangible Assets, Accumulated Amortization	4,525	5,976
Finite-Lived Intangible Assets, Net	4,648	1,983
Tradenames \| Minimum
Acquired Intangible Assets
Estimated useful life in years	3 years	5 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	3,948	3,866
Finite-Lived Intangible Assets, Accumulated Amortization	2,233	2,210
Finite-Lived Intangible Assets, Net	1,715	1,656
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	360
Finite-Lived Intangible Assets, Accumulated Amortization	102
Finite-Lived Intangible Assets, Net	258
Other \| Minimum
Acquired Intangible Assets
Estimated useful life in years	2 years
Other \| Maximum
Acquired Intangible Assets
Estimated useful life in years	12 years