Investments (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended		7 Months Ended	12 Months Ended	24 Months Ended
	Nov. 22, 2016	Jul. 05, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Nov. 30, 2016	Jun. 05, 2016
Schedule of Equity Method Investments [Line Items]
Capital investments			$ 115,606		$ 115,606		$ 115,606	$ 115,606	$ 115,606	$ 107,320
Earnout			4,049		4,049		4,049	4,049	4,049	$ 4,270
Earnings in equity investments			1,042		1,524	$ 12
Amortization of intangible assets			3,412	$ 3,459	6,824	6,917
Cash distributions					12,044	$ 3,025
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			4,800			8,100	8,100
Assumption of capital commitments in joint venture		$ 7,400
Capital investments			45,600		45,600		45,600	45,600	45,600
Agreement term		15 years
Earnings in equity investments			1,400		2,600
Cash distributions					3,700
Carnero Gathering LLC, Joint Venture | Customer Relationships
Schedule of Equity Method Investments [Line Items]
Intangible asset, fair value		$ 13,000
Amortization of intangible assets			200		400
Carnero Processing Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%										50.00%
Payments to acquire interest in joint venture	$ 55,500						14,100
Assumption of capital commitments in joint venture	24,500
Payments of capital commitments from joint venture					3,500
Capital investments	$ 48,000		70,000		70,000		$ 70,000	$ 70,000	$ 70,000
Earnings in equity investments			200		600
TPL South Tex Processing Company LP
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)	50.00%	50.00%
SN Midstream | Carnero Gathering LLC, Joint Venture
Schedule of Equity Method Investments [Line Items]
Capital investments												$ 26,000
Earnout payments			$ 0		$ 0