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REVENUE RECOGNITION - Deferred revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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