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REVENUE RECOGNITION - Deferred revenue (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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REVENUE RECOGNITION |  |  |  |
Deferred revenue, current | $ 268,847 | $ 237,344 |  |
Deferred revenue, non-current | 10,289 | 11,666 |  |
Total deferred revenue | $ 279,136 | $ 249,010 | $ 222,262 | $ 205,791

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