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NONCONTROLLING INTERESTS - Components of Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]    
Redeemable noncontrolling interests $ 0 $ 1,383
Noncontrolling interests 0 0
DGHM    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable noncontrolling interests $ 0 $ 1,400