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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
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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

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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