Variable Interest Entities (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended	21 Months Ended
	Nov. 22, 2016	Jul. 05, 2016	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Jul. 31, 2016
Variable Interest Entity [Line Items]
Capital investments			$ 109,441	$ 109,441	$ 107,320	$ 109,441
Earnings in equity investments			2,919	2,919	2,301	2,919
Distributions received			(4,950)		(2,950)
Estimated earnout accrued			4,049	4,049	4,270	4,049
Equity in equity investments			111,459	111,459	110,941	111,459
Guarantees of capital investments			15,462	15,462	17,584	15,462
Maximum exposure to loss			126,921	126,921	$ 128,525	126,921
Carnero Processing Joint Venture
Variable Interest Entity [Line Items]
Ownership interest (as a percent)	50.00%
Payments to acquire interest in joint venture	$ 55,500
Assumption of capital commitments in joint venture	24,500
Debt incurred			0	0		0
Capital investments	$ 48,000		68,500	68,500		68,500
Maximum exposure to loss			79,600	79,600		79,600
Carnero Gathering LLC, Joint Venture
Variable Interest Entity [Line Items]
Ownership interest (as a percent)		50.00%					50.00%
Payments to acquire interest in joint venture		$ 37,000	100	3,500		3,500
Assumption of capital commitments in joint venture		$ 7,400
Debt incurred			0	0		0
Capital investments			41,000	41,000		41,000
Maximum exposure to loss			$ 47,300	$ 47,300		$ 47,300