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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 124,458 $ 81,808    
Restricted cash 3,750 1,549    
Cash, Cash Equivalents and Restricted Cash 128,208 $ 83,357 $ 115,453 $ 96,490
Cash Balance Associated with Provider Relief Fund 58,500      
Various acquisitions        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 3,800