v3.20.1
SERIES D CUMULATIVE CONVERTIBLE PREFERRED UNITS Narrative (Details) - Series D Preferred Limited Partner [Member] - $ / shares
3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Preferred Stock, Distributions, Period - June 29, 2018 to June 28, 2020 [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage   9.75%
Preferred stock, dividend amount, per unit   $ 0.619
Preferred Stock, Distributions, Period - June 29, 2020 to June 28, 2023 [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage   10.75%
Preferred stock, dividend amount, per unit   $ 0.682
Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]    
Class of Stock [Line Items]    
Preferred units, dividend payment rate, variable   the greater of 13.75% per annum (or $0.872 per unit per distribution period) or the distribution per common unit thereafter
Preferred Stock Distributions, Period - June 16, 2019 and thereafter [Member]    
Class of Stock [Line Items]    
Required amount of per unit cash dividends to permit dividend paid in kind   $ 0.635
Subsequent Event [Member]    
Class of Stock [Line Items]    
Preferred unit distribution $ 0.619  
Minimum [Member] | Preferred Stock, Distributions, Period - June 29, 2023 and thereafter [Member]    
Class of Stock [Line Items]    
Preferred units distribution percentage   13.75%
Preferred stock, dividend amount, per unit   $ 0.872