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REPORTABLE SEGMENTS AND GEOGRAPHICAL INFORMATION (Schedule of Total Revenues from External Customers by Geographical Areas) (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] |  |  |  |
Revenues |  | $ 1,332,152 | $ 1,015,542 | $ 926,867
United States [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues |  | 1,035,871 | 720,520 | 630,096
EMEA [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | [1] | 186,268 | 189,223 | 192,640
Israel [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues |  | 3,693 | 4,295 | 4,231
Asia Pacific [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues |  | $ 106,320 | $ 101,504 | $ 99,900
[1] | Includes Europe, the Middle East (excluding Israel) and Africa.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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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