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LONG-TERM DEBT - Mandatorily Redeemable Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
May 01, 2019
Debt Instrument [Line Items]        
Preferred stock, shares issued (in shares) 0   0  
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001  
Preferred stock issued $ 0   $ 0  
Redeemable Preferred Stock        
Debt Instrument [Line Items]        
Preferred stock, shares issued (in shares)       60,000
Preferred stock, par value (in dollars per share)       $ 0.001
Liquidation preference value 60,000     $ 60,000
Preferred stock issued       $ 60,000
Interest expense paid on dividends $ 2,400 $ 1,800