Investments (Details) - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Jul. 05, 2016	Jul. 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Oct. 06, 2016	Jul. 04, 2016	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Agreement term						15 years
Earnings in equity investments				$ 1,124	$ 48	$ 1,136	$ 2
Amortization of intangible asset						10,345
Carnero Gathering LLC, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%
Payments to acquire interest in joint venture	$ 37,000	$ 3,000	$ 3,000
Assumption of capital commitments in joint venture	$ 7,400
Capital investments			40,002	40,002		40,002
Agreement term	15 years
Estimated earnout accrued			$ 4,270	4,270		4,270
Earnings in equity investments				1,300		1,300
Carnero Gathering LLC, Joint Venture | Customer Relationships
Schedule of Equity Method Investments [Line Items]
Intangible asset, fair value	$ 13,000
Amortization of intangible asset				$ 200		$ 200
TPL South Tex Processing Company LP
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%
SN Midstream | Carnero Gathering LLC, Joint Venture
Schedule of Equity Method Investments [Line Items]
Capital investments									$ 26,000	$ 26,000
Subsequent Event | TPL South Tex Processing Company LP
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)								50.00%
Subsequent Event | SN Midstream | Carnero Gathering LLC, Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)								50.00%