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Revenue Disaggregated Revenue by Geography (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 312,282 | $ 360,460 | $ 643,214 | $ 732,493
EMEA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,978 | 33,867 | 65,356 | 73,391
Other foreign countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,594 | 51,777 | 102,955 | 102,709
Foreign [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 84,572 | 85,644 | 168,311 | 176,100
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 227,710 | $ 274,816 | $ 474,903 | $ 556,393

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