Goodwill And Other Intangible Assets (Schedule Of Gross Carrying Amount And Accumulated Amortization Of Identifiable Intangible Assets, Other Than Goodwill) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Identifiable Intangible Assets [Line Items]
Intangible assets, Accumulated Amortization	$ (106,741)	$ (95,242)
Total other intangible assets, Gross Carrying Amount	385,124	384,830
Customer Lists And Relationships [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	117,868	118,844
Intangible assets, Accumulated Amortization	(35,000)	(29,973)
Acquired Technology [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	97,698	94,689
Intangible assets, Accumulated Amortization	(57,730)	(53,224)
Trade Names [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	54,292	55,320
Intangible assets, Accumulated Amortization	(10,068)	(8,621)
Unamortized intangible assets, Gross Carrying Amount	108,470	108,633
Other Intangible Assets [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	6,796	7,344
Intangible assets, Accumulated Amortization	$ (3,943)	$ (3,424)