Oil and Natural Gas Properties Acquisitions - Pro Forma Information (Details) - Noble Acquisition - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenue and other income	$ 468,103	$ 288,772
Net income (loss)	178,970	33,264
Net income attributable to noncontrolling interests subsequent to initial public offering	34	12
Distributions on Series A redeemable preferred units	(3,117)	(5,763)
Distributions on Series B cumulative convertible preferred units	(21,000)	(21,000)
NET INCOME (LOSS) ATTRIBUTABLE TO THE GENERAL PARTNER AND COMMON AND SUBORDINATED UNITS SUBSEQUENT TO INITIAL PUBLIC OFFERING	154,887	6,513
Allocation of net income (loss):
General partner interest	0	0
Common Units
Allocation of net income (loss):
Allocation of loss	$ 99,776	$ 20,696
DISTRIBUTIONS DECLARED AND PAID SUBSEQUENT TO INITIAL PUBLIC OFFERING:
Per unit (basic) (in usd per share)	$ 1.02	$ 0.22
Per unit (diluted) (in usd per share)	$ 1.02	$ 0.22
Subordinated Units
Allocation of net income (loss):
Allocation of loss	$ 55,111	$ (14,183)
DISTRIBUTIONS DECLARED AND PAID SUBSEQUENT TO INITIAL PUBLIC OFFERING:
Per unit (basic) (in usd per share)	$ 0.58	$ (0.15)
Per unit (diluted) (in usd per share)	$ 0.58	$ (0.15)