SUMMARY OF SIGNIFICANT ACCOUNTING POLICIE (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Contributed Assets [Line Items]
Allowance for doubtful accounts					$ 0
Change in ownership of consolidated subsidiaries		$ 90,613,000	$ 90,600,000
Unrecognized tax benefits material impact on the effective tax rate		0	0
Unrecognized tax benefits, income tax penalties and interest expense			0
Contribution of property				$ 456,100,000
Capital contribution related to equity method investments				149,500,000
Capital contribution related to elimination of current and deferred liabilities				31,100,000
Capital contribution in additional assets and liabilities, net, related to operations				(25,300,000)
Office building
Contributed Assets [Line Items]
Contribution of property				9,200,000
Land
Contributed Assets [Line Items]
Contribution of property				18,100,000
Fresh water asset
Contributed Assets [Line Items]
Contribution of property				9,400,000
Produced Water Disposal Assets
Contributed Assets [Line Items]
Contribution of property				228,300,000
Crude oil assets
Contributed Assets [Line Items]
Contribution of property				$ 35,800,000
Other Ownership Interest
Contributed Assets [Line Items]
Change in ownership of consolidated subsidiaries			419,600,000
Limited Partners
Contributed Assets [Line Items]
Change in ownership of consolidated subsidiaries	$ 0	(329,034,000)	(329,034,000)
Limited Partners | Common Units
Contributed Assets [Line Items]
Change in ownership of consolidated subsidiaries		$ (329,034,000)	$ (329,000,000.0)