Goodwill And Other Intangible Assets (Schedule Of Gross Carrying Amount And Accumulated Amortization Of Identifiable Intangible Assets, Other Than Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Accumulated Amortization	$ (119,904)	$ (109,639)
Total other intangible assets, Gross Carrying Amount	473,145	458,523
Customer Lists And Relationships [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	178,643	172,724
Amortized intangible assets, Accumulated Amortization	(39,545)	(36,028)
Acquired Technology [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	101,321	99,383
Amortized intangible assets, Accumulated Amortization	(58,385)	(56,879)
Other Intangible Assets [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	11,811	9,171
Amortized intangible assets, Accumulated Amortization	(10,547)	(6,141)
Trademarks [Member]
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	55,279	53,510
Amortized intangible assets, Accumulated Amortization	(11,427)	(10,591)
Trademarks [Member]
Identifiable Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Amount	$ 126,091	$ 123,735