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Segment Information Revenues By Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 550,776 | $ 486,747 | $ 503,082 | $ 477,592 | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 | $ 2,018,197 | $ 2,013,186 | $ 1,883,533
United States and Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,137,508 | 1,126,787 | 997,293
EMEA [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 672,942 | 698,106 | 701,301
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 207,747 | $ 188,293 | $ 184,939

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