SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS - Schedule of Preferred Units (Details) - USD ($) $ in Thousands	Jun. 12, 2019	Mar. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Redeemable noncontrolling interest — Preferred Unit limited partners	$ 516,790	$ 573,861
Embedded derivative	94,459	164,913	$ 102,929
Transaction price, net	611,249
Preferred Unit limited partners
Class of Stock [Line Items]
Transaction price, gross	625,000
Issue discount	(3,675)
Transaction costs to other third parties	(10,076)
Transaction price, net	$ 611,249
Redeemable noncontrolling interest — Preferred Unit limited partners		$ 573,861	$ 555,599