Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Midstream Services — Affiliate	$ 113,784	$ 103,803
Total Revenues	224,045	160,702
Goodwill Impairment	109,734	0
Income (Loss) Before Income Taxes	(37,367)	69,100
Additions to Long-Lived Assets	47,728	78,201
Additions to Investments	225,599	270,603
Total Assets	3,046,974		$ 2,926,082
Gathering Systems
Segment Reporting Information [Line Items]
Midstream Services — Affiliate	90,185	76,216
Total Revenues	196,272	129,306
Goodwill Impairment	109,734
Income (Loss) Before Income Taxes	(41,218)	53,660
Additions to Long-Lived Assets	47,619	75,176
Additions to Investments	0	0
Total Assets	2,066,048		2,160,026
Fresh Water Delivery
Segment Reporting Information [Line Items]
Midstream Services — Affiliate	23,599	27,587
Total Revenues	27,773	31,396
Goodwill Impairment	0
Income (Loss) Before Income Taxes	22,443	23,209
Additions to Long-Lived Assets	0	2,756
Additions to Investments	0	0
Total Assets	94,420		91,840
Investments in Midstream Entities
Segment Reporting Information [Line Items]
Midstream Services — Affiliate	0	0
Total Revenues	0	0
Goodwill Impairment	0
Income (Loss) Before Income Taxes	(5,409)	2,341
Additions to Long-Lived Assets	0	0
Additions to Investments	225,599	270,603
Total Assets	871,030		660,778
Corporate
Segment Reporting Information [Line Items]
Midstream Services — Affiliate	0	0
Total Revenues	0	0
Goodwill Impairment	0
Income (Loss) Before Income Taxes	(13,183)	(10,110)
Additions to Long-Lived Assets	109	269
Additions to Investments	0	0
Total Assets	15,476		$ 13,438
Midstream Services — Third Party
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	27,898	24,029
Midstream Services — Third Party | Gathering Systems
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	23,724	20,220
Midstream Services — Third Party | Fresh Water Delivery
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	4,174	3,809
Midstream Services — Third Party | Investments in Midstream Entities
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	0	0
Midstream Services — Third Party | Corporate
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	0	0
Crude Oil Sales — Third Party
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	82,363	32,870
Crude Oil Sales — Third Party | Gathering Systems
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	82,363	32,870
Crude Oil Sales — Third Party | Fresh Water Delivery
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	0	0
Crude Oil Sales — Third Party | Investments in Midstream Entities
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	0	0
Crude Oil Sales — Third Party | Corporate
Segment Reporting Information [Line Items]
Services and Sales Revenues - Third Party	$ 0	$ 0