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SEGMENT AND GEOGRAPHICAL INFORMATION - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 1,511,774 $ 1,144,721
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 1,420,358 1,086,379
International    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 91,416 $ 58,342