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Revenue Recognition (Disaggregation of Revenue by Principal Geographic Area, Based on Customers' Domiciles) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 626,336 | $ 576,056
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 396,783 | 358,288
Europe, the Middle East and Africa |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 129,766 | 121,746
Asia Pacific Region |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 63,512 | 60,075
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 24,247 | 23,224
Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 12,028 | $ 12,723

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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