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EQUITY AND MEZZANINE EQUITY - Schedule of Conversions of Common Stock (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
tradingDay
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Conversion of Stock [Line Items]    
Number of units converted (in shares) | shares 0 0
Aggregate cost $ 9 $ 14
Average price per unit (in shares) | $ / shares $ 71.55 $ 74.45
Number of trading days used for computation of weighted average price | tradingDay 10  
Net Book Basis $ 220 $ 930
Exercise of Exchange Rights    
Conversion of Stock [Line Items]    
Number of units (in shares) | shares 26 14
Net Book Basis $ (220) $ (930)