Investments (Narrative) (Details) a in Thousands, $ in Thousands	1 Months Ended				3 Months Ended		9 Months Ended
	May 31, 2018 a MMcf	Apr. 30, 2018 MMcf	Nov. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity investments					$ 984	$ 377	$ 1,436	$ 5,688
Amortization of intangible assets					2,737	$ 2,737	8,211	8,839
Distributions received							1,704	$ 11,671
Carnero Gathering, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)				50.00%
Payments to acquire joint venture				$ 37,000			124,700
Assumption of capital commitments in joint venture				7,400
Daily processing capacity | MMcf	400
Carnero Gathering, Joint Venture | Customer Relationships
Schedule of Equity Method Investments [Line Items]
Intangible asset, fair value				$ 13,000
Agreement term (in years)				15 years
Carnero Processing, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			50.00%
Payments to acquire joint venture			$ 55,500
Assumption of capital commitments in joint venture			$ 24,500
Carnero Gathering and Carnero Processing
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%
Carnero G&P, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%
Payments to acquire joint venture							124,700
Daily processing capacity | MMcf	460	260
Earnings (loss) from equity investments					1,300		2,300
Distributions received							1,700
Carnero G&P, Joint Venture | Customer Relationships
Schedule of Equity Method Investments [Line Items]
Amortization of intangible assets					$ 300		$ 900
Mesquite Energy, Inc. | Carnero Gathering, Joint Venture | Western Eagle Ford
Schedule of Equity Method Investments [Line Items]
Acres dedicated for gathering | a	315
Targa | Carnero Gathering, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)				50.00%
Targa | Carnero Processing, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			50.00%
Targa | SIlver Oak II
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	100.00%