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SEGMENT INFORMATION - Schedule of Contribution Profit by Segment (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 967,108,000 | $ 1,416,868,000 | $ 2,218,915,000
Cost of revenue |  | 229,992,000 | 739,574,000 | 1,032,786,000
Marketing |  | 188,780,000 | 154,534,000 | 339,355,000
Contribution profit |  | 548,336,000 | 522,760,000 | 846,774,000
Selling, general and administrative |  | 511,096,000 | 603,185,000 | 806,945,000
Goodwill impairment | $ 0 | 0 | 109,486,000 | 0
Long-lived asset impairment |  | 0 | 22,351,000 | 0
Restructuring and related charges |  | 41,895,000 | 64,836,000 | 31,000
Income (loss) from operations |  | (4,655,000) | (277,098,000) | 39,798,000
North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 607,055,000 | 818,624,000 | 1,358,907,000
Cost of revenue |  | 71,392,000 | 342,993,000 | 551,162,000
Marketing |  | 138,025,000 | 96,039,000 | 214,069,000
Contribution profit |  | 397,638,000 | 379,592,000 | 593,676,000
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | 360,053,000 | 598,244,000 | 860,008,000
Cost of revenue |  | 158,600,000 | 396,581,000 | 481,624,000
Marketing |  | 50,755,000 | 58,495,000 | 125,286,000
Contribution profit |  | $ 150,698,000 | $ 143,168,000 | $ 253,098,000

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