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Geographic Information And Selected Statements Of Income Data (Summary Of Revenue By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule Of Geographical Information [Line Items]      
Revenues $ 1,246,986 $ 1,097,868 $ 924,417
Americas, Principally U.S. [Member]
     
Schedule Of Geographical Information [Line Items]      
Revenues 553,843 479,692 398,367
Europe [Member]
     
Schedule Of Geographical Information [Line Items]      
Revenues 488,632 440,620 380,101
Asia, Middle-East And Africa [Member]
     
Schedule Of Geographical Information [Line Items]      
Revenues $ 204,511 $ 177,556 $ 145,949