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SUBSEQUENT EVENTS (Details) - $ / shares
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended
Nov. 17, 2017
Aug. 18, 2017
May 30, 2017
Mar. 10, 2017
Mar. 31, 2018
Feb. 28, 2018
Feb. 28, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Feb. 28, 2018
Subsequent events                                
Quarterly distribution declared (in dollars per unit) $ 0.41 $ 0.31 $ 0.13 $ 0.28       $ 0.25 $ 0.41 $ 0.31 $ 0.13 $ 0.28 $ 0.20 $ 0.28 $ 0.15  
Subsequent event                                
Subsequent events                                
Preferred equity quarterly distribution (in dollars per unit)           $ 0.4375                    
Forecast                                
Subsequent events                                
Quarterly distribution declared (in dollars per unit)         $ 0.0933                      
Forecast | Subsequent event                                
Subsequent events                                
Quarterly distribution declared (in dollars per unit)             $ 0.15                 $ 0.40