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BUSINESS COMBINATIONS AND ASSET ACQUISITIONS - Schedule of Pro Forma Thrive Information (Details) - Thrive - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Total revenues | $ 456,379 | $ 408,363 | $ 1,293,275 | $ 1,025,052
Net loss before tax | $ (170,797) | $ (224,860) | $ (536,253) | $ (575,981)

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