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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting Information [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
U.S | $ | 756,907 |  |  | $ | 707,906 |  |  | $ | 667,301 |
EMEA | 212,699 |  |  | 211,349 |  |  | 207,474 |
China | 106,841 |  |  | 106,526 |  |  | 127,298 |
Other | 138,522 |  |  | 139,314 |  |  | 140,094 |
Total revenues | $ | 1,214,969 |  |  | $ | 1,165,095 |  |  | $ | 1,142,167 |

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