Acquisitions and Divestitures (Pro Forma) (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 03, 2015	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares
Business Acquisition [Line Items]
Earnings in equity investments		$ 1,124	$ 48	$ 1,136	$ 2
Revenues		19,854	36,219	55,369	77,341
Net income (loss) attributable to common unitholders		9,519	$ (5,054)	$ (16,114)	(130,036)
Reverse stock split ratio	0.1
Revenues, actual		15,208			47,365
Excess of revenues over direct operating expenses, actual		$ 11,415			$ 35,086
Class A Units
Business Acquisition [Line Items]
Net income (loss) - pro forma basic and diluted (in dollars per unit) | $ / shares					$ (23.87)
Class B Units
Business Acquisition [Line Items]
Net income (loss) - pro forma basic and diluted (in dollars per unit) | $ / shares					(18.99)
Common Units
Business Acquisition [Line Items]
Net income (loss) - pro forma basic (in dollars per unit) | $ / shares		$ 2.38	$ (1.18)	$ (4.08)	(16.64)
Net income (loss) - pro forma diluted (in dollars per unit) | $ / shares		$ 1.21	$ (1.18)	$ (4.08)	$ (16.64)
Reverse stock split ratio	0.1
Carnero Gathering LLC, Joint Venture
Business Acquisition [Line Items]
Earnings in equity investments		$ 1,300		$ 1,300