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Segment Information Revenues By Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 495,713 | $ 506,859 | $ 513,024 | $ 497,590 | $ 496,448 | $ 469,528 | $ 470,811 | $ 446,746 | $ 2,013,186 | $ 1,883,533 | $ 1,947,616
United States and Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,126,787 | 997,293 | 875,796
EMEA [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 698,106 | 701,301 | 849,841
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 188,293 | $ 184,939 | $ 221,979

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