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SEGMENT AND GEOGRAPHIC INFORMATION (Total Revenue by Major Geographic Area) (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net | $ 368,602 | $ 278,834 | $ 282,164 | $ 258,636 | $ 255,664 | $ 250,332 | $ 249,309 | $ 236,770 | $ 1,188,236 | $ 992,075 | $ 882,734
Total long-lived assets | 285,329 |  |  |  | 234,103 |  |  |  | 285,329 | 234,103 |
United States (Includes long-lived assets in Puerto Rico) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net |  |  |  |  |  |  |  |  | 894,260 | 765,608 | 680,824
Total long-lived assets | 247,154 |  |  |  | 213,898 |  |  |  | 247,154 | 213,898 |
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net |  |  |  |  |  |  |  |  | 150,147 | 120,588 | 103,057
Total long-lived assets | 30,942 |  |  |  | 18,970 |  |  |  | 30,942 | 18,970 |
Rest of the World |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net |  |  |  |  |  |  |  |  | 143,829 | 105,879 | $ 98,853
Total long-lived assets | $ 7,233 |  |  |  | $ 1,235 |  |  |  | $ 7,233 | $ 1,235 |

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