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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 04, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]        
Payments to Acquire Equity Investments   $ 875 $ 210 $ 7,144
Purchase of company stock   0 0 181,402
Medalogix        
Related Party Transaction [Line Items]        
Payments to Acquire Equity Investments       $ 7,000
Related party transaction, amount of transaction   $ 3,900 $ 500  
KKR Share Repurchase [Member]        
Related Party Transaction [Line Items]        
Shares repurchased (shares) 2,418,304      
Percentage of Shares Outstanding 7.10%      
Purchase of company stock $ 181,400      
Discounted Closing Stock Price $ 73.96      
Percentage of Closing Stock Price 96.00%      
KKR Share Repurchase [Member] | KKR Consulting [Member]        
Related Party Transaction [Line Items]        
Percentage of Shares Outstanding 14.20%