Goodwill And Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	$ 76,964	$ 76,418
Total acquired intangible assets, Gross Carrying Amount	123,894	123,178
Accumulated Amortization, Finite-lived intangible assets	29,720	27,913
Total acquired intangible assets, Accumulated Amortization	29,720	27,913
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets	46,930	46,760
Gross Carrying Amount, Finite-lived intangible assets	1,970	1,968
Accumulated Amortization, Finite-lived intangible assets	941	921
Accumulated Amortization, Indefinite-lived intangible assets
Estimated Life, Minimum years	2
Estimated Life, Maximum years	15
Unpatented Technology And Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	22,117	22,117
Accumulated Amortization, Finite-lived intangible assets	3,974	3,577
Estimated Life, Minimum years	5
Estimated Life, Maximum years	20
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	48,820	48,276
Accumulated Amortization, Finite-lived intangible assets	21,619	20,512
Estimated Life, Minimum years	5
Estimated Life, Maximum years	16
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	2,857	2,857
Accumulated Amortization, Finite-lived intangible assets	2,386	2,303
Estimated Life, Minimum years	5
Estimated Life, Maximum years	10
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	1,200	1,200
Accumulated Amortization, Finite-lived intangible assets	$ 800	$ 600
Estimated Life, Minimum years	1
Estimated Life, Maximum years	2