SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended					4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	May 28, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment								2
Total revenues	$ 96,539			$ 115,415				$ 314,669	$ 322,365
Direct operating expenses	31,173			29,789				101,425	76,381
Cost of goods sold (exclusive of depreciation and amortization)	6,663			17,350				27,368	46,252
Real estate operating expenses	494			742				1,812	1,963
Depreciation, amortization and accretion	10,990			11,736				35,596	31,798
(Gain) loss on disposal of property, plant and equipment	(16)			0				2,765	(4)
(Income) loss from equity method investments	(3,369)			631				9,910	695
General and administrative expenses	(3,140)			(3,240)				(11,829)	(7,677)
Interest income (expense), net	(5,817)			(553)				(10,364)	(638)
Net income (loss) before income taxes	41,647			51,374				113,600	156,965
Provision for (benefit from) income taxes	2,851			3,294		$ 4,700	$ 18,200	7,754	22,850
Net income (loss)	38,796	$ 12,462	$ 54,588	48,080	$ 39,356			105,846	134,115
Segment assets	1,812,243							1,812,243		$ 1,636,393
Midstream Services
Segment Reporting Information [Line Items]
Total revenues	93,075			111,706				303,964	311,913
Direct operating expenses	31,173			29,789				101,425	76,381
Cost of goods sold (exclusive of depreciation and amortization)	6,663			17,350				27,368	46,252
Real estate operating expenses	0			0				0	0
Depreciation, amortization and accretion	9,255			9,835				30,351	26,028
(Gain) loss on disposal of property, plant and equipment	(16)			0				2,765	(4)
(Income) loss from equity method investments	(3,369)			631				9,910	695
Net income (loss) before income taxes	49,369			54,101				132,145	162,561
Net income (loss)	49,369			54,101				132,145	162,561
Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	3,464			3,709				10,705	10,452
Direct operating expenses	0			0				0	0
Cost of goods sold (exclusive of depreciation and amortization)	0			0				0	0
Real estate operating expenses	494			742				1,812	1,963
Depreciation, amortization and accretion	1,735			1,901				5,245	5,770
(Gain) loss on disposal of property, plant and equipment	0			0				0	0
(Income) loss from equity method investments	0			0				0	0
Net income (loss) before income taxes	1,235			1,066				3,648	2,719
Net income (loss)	1,235			1,066				3,648	2,719
Revenues—related party
Segment Reporting Information [Line Items]
Total revenues	85,846			104,866				280,460	296,508
Revenues—related party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	85,846			104,866				280,460	296,508
Revenues—related party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Revenues—third party
Segment Reporting Information [Line Items]
Total revenues	7,229			6,840				23,504	15,405
Revenues—third party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	7,229			6,840				23,504	15,405
Revenues—third party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Rental income—related party
Segment Reporting Information [Line Items]
Total revenues	2,282			1,399				5,101	3,370
Rental income—related party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Rental income—related party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	2,282			1,399				5,101	3,370
Rental income—third party
Segment Reporting Information [Line Items]
Total revenues	867			1,894				4,653	5,999
Rental income—third party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Rental income—third party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	867			1,894				4,653	5,999
Other real estate income—related party
Segment Reporting Information [Line Items]
Total revenues	149			111				318	265
Other real estate income—related party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Other real estate income—related party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	149			111				318	265
Other real estate income—third party
Segment Reporting Information [Line Items]
Total revenues	166			305				633	818
Other real estate income—third party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues	0			0				0	0
Other real estate income—third party | Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues	166			305				633	818
Operating Segments
Segment Reporting Information [Line Items]
Net income (loss) before income taxes	50,604			55,167				135,793	165,280
Provision for (benefit from) income taxes	2,851			3,294
Segment assets	1,812,243							1,812,243		1,636,393
Operating Segments | Midstream Services
Segment Reporting Information [Line Items]
Net income (loss) before income taxes	49,369			54,101				132,145	162,561
Provision for (benefit from) income taxes	0			0
Segment assets	1,552,100							1,552,100		1,436,213
Operating Segments | Real Estate Operations
Segment Reporting Information [Line Items]
Net income (loss) before income taxes	1,235			1,066				3,648	2,719
Provision for (benefit from) income taxes	0			0
Segment assets	105,050							105,050		$ 108,239
Segment Reconciling Items
Segment Reporting Information [Line Items]
General and administrative expenses	(3,140)			(3,240)				(11,829)	(7,677)
Interest income (expense), net	$ (5,817)			$ (553)				$ (10,364)	$ (638)