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SEGMENT REPORTING - Total Revenues Based on Location of the Customer and Long-Lived Assets by Geographic Regions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Total revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 3,959,786 | $ 3,784,451 | $ 3,710,018 | $ 3,415,125 | $ 3,414,975 | $ 3,355,754 | $ 3,299,741 | $ 3,073,943 | $ 14,869,380 | $ 13,144,413 | $ 13,476,084
Long-lived assets |  |  |  |  |  |  |  |  |  |  |
Total long-lived assets | 442,212 |  |  |  | 444,610 |  |  |  | 442,212 | 444,610 | 345,323
United States |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 12,865,087 | 11,749,602 | 12,097,633
Long-lived assets |  |  |  |  |  |  |  |  |  |  |
Total long-lived assets | 335,072 |  |  |  | 348,299 |  |  |  | 335,072 | 348,299 | 320,445
Other locations |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 2,004,293 | 1,394,811 | 1,378,451
Long-lived assets |  |  |  |  |  |  |  |  |  |  |
Total long-lived assets | $ 107,140 |  |  |  | $ 96,311 |  |  |  | $ 107,140 | $ 96,311 | $ 24,878

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