SEGMENT INFORMATION (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended				5 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	May 28, 2019 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	May 28, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment								2
Total revenues			$ 88,735		$ 111,774			$ 218,130	$ 206,950
Direct operating expenses			37,378		26,406			70,252	46,592
Cost of goods sold (exclusive of depreciation and amortization)			4,744		15,849			20,705	28,902
Real estate operating expenses			590		695			1,318	1,221
Depreciation, amortization and accretion			12,100		10,158			24,606	20,062
Loss (gain) on disposal of property, plant and equipment			1,243		(4)			2,781	(4)
Loss from equity method investments			13,034		114			13,279	64
General and administrative expenses			(4,175)		(3,068)			(8,689)	(4,437)
Interest expense, net			(1,926)		(85)			(4,547)	(85)
Net income before income taxes			13,545		55,403			71,953	105,591
Provision for income taxes	$ 1,400	$ 7,400	1,083		8,724		$ 18,200	4,903	19,556
Net income			12,462	$ 54,588	46,679	$ 39,356		67,050	86,035
Segment assets			1,779,023					1,779,023		$ 1,636,393
Midstream Services
Segment Reporting Information [Line Items]
Total revenues			85,206		108,144			210,889	200,207
Direct operating expenses			37,378		26,406			70,252	46,592
Cost of goods sold (exclusive of depreciation and amortization)			4,744		15,849			20,705	28,902
Real estate operating expenses			0		0			0	0
Depreciation, amortization and accretion			10,354		8,235			21,096	16,193
Loss (gain) on disposal of property, plant and equipment			1,243		(4)			2,781	(4)
Loss from equity method investments			13,034		114			13,279	64
Net income before income taxes			18,453		57,544			82,776	108,460
Net income			18,453		57,544			82,776	108,460
Real Estate Operations
Segment Reporting Information [Line Items]
Total revenues			3,529		3,630			7,241	6,743
Direct operating expenses			0		0			0	0
Cost of goods sold (exclusive of depreciation and amortization)			0		0			0	0
Real estate operating expenses			590		695			1,318	1,221
Depreciation, amortization and accretion			1,746		1,923			3,510	3,869
Loss (gain) on disposal of property, plant and equipment			0		0			0	0
Loss from equity method investments			0		0			0	0
Net income before income taxes			1,193		1,012			2,413	1,653
Net income			1,193		1,012			2,413	1,653
Revenues—related party
Segment Reporting Information [Line Items]
Total revenues			78,031		103,066			194,614	191,642
Revenues—related party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues			78,031		103,066			194,614	191,642
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			7,175		5,078			16,275	8,565
Revenues—third party | Midstream Services
Segment Reporting Information [Line Items]
Total revenues			7,175		5,078			16,275	8,565
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			1,417		1,256			2,819	1,971
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			1,417		1,256			2,819	1,971
Rental income—third party
Segment Reporting Information [Line Items]
Total revenues			1,885		2,038			3,786	4,105
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			1,885		2,038			3,786	4,105
Other real estate income—related party
Segment Reporting Information [Line Items]
Total revenues			53		81			169	154
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			53		81			169	154
Other real estate income—third party
Segment Reporting Information [Line Items]
Total revenues			174		255			467	513
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			174		255			467	513
Operating Segments
Segment Reporting Information [Line Items]
Net income before income taxes			19,646		58,556			85,189	110,113
Segment assets			1,779,023					1,779,023		1,636,393
Operating Segments | Midstream Services
Segment Reporting Information [Line Items]
Net income before income taxes			18,453		57,544			82,776	108,460
Segment assets			1,556,621					1,556,621		1,436,213
Operating Segments | Real Estate Operations
Segment Reporting Information [Line Items]
Net income before income taxes			1,193		1,012			2,413	1,653
Segment assets			104,542					104,542		$ 108,239
Segment Reconciling Items
Segment Reporting Information [Line Items]
General and administrative expenses			(4,175)		(3,068)			(8,689)	(4,437)
Interest expense, net			$ (1,926)		$ (85)			$ (4,547)	$ (85)