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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Restructuring and Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2020
Dec. 31, 2018
Restructuring        
Restructuring charges incurred $ 1,200 $ 15,100 $ 2,600  
Restructuring Charges $ 1,175 $ 15,148 $ 2,580 $ 128