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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue Recognition [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
U.S. | $ | 191,848 |  |  | $ | 187,818 |  |  | $ | 384,003 |  |  | $ | 373,001 |
EMEA | 51,595 |  |  | 53,367 |  |  | 103,741 |  |  | 106,784 |
China | 29,448 |  |  | 26,550 |  |  | 57,690 |  |  | 52,408 |
Other | 33,398 |  |  | 34,717 |  |  | 67,263 |  |  | 69,547 |
Total revenues | $ | 306,289 |  |  | $ | 302,452 |  |  | $ | 612,697 |  |  | $ | 601,740 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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