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Geographic And Customer Information (Comparison Of Geographic Revenues) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 1,165,095 | $ 1,142,167 | $ 1,059,366
U.S. [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 694,759 | 667,301 | 639,170
EMEA [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 211,349 | 207,474 | 193,623
Asia Pacific [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 106,526 | 127,298 | 83,456
Other [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 152,461 | $ 140,094 | $ 143,117

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: 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=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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