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PARTNERS' CAPITAL AND MEZZANINE CAPITAL- Change in Subsidiary (Details) - Series A Preferred Units
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
shares
Partners Capital [Line Items]  
Balance $ 89,658
PIK distributions | shares 1,494
Redemption accretion $ 2,438
Balance $ 93,590