Oil and Natural Gas Properties Acquisitions - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net income (loss) attributable to the general partner and common and subordinated units	$ 154,887	$ 6,513
Noble Acquisition
Business Acquisition [Line Items]
Revenue and other income	468,103	288,772
Net income (loss)	178,970	33,264
Net income (loss) attributable to noncontrolling interests	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	154,887	6,513
ALLOCATION OF NET INCOME (LOSS):
General partner interest	0	0
Common Units | Noble Acquisition
ALLOCATION OF NET INCOME (LOSS):
Allocation of loss	$ 99,776	$ 20,696
DISTRIBUTIONS DECLARED AND PAID:
Per unit (basic) (in usd per share)	$ 1.02	$ 0.22
Per unit (diluted) (in usd per share)	$ 1.02	$ 0.22
Subordinated Units | Noble Acquisition
ALLOCATION OF NET INCOME (LOSS):
Allocation of loss	$ 55,111	$ (14,183)
DISTRIBUTIONS DECLARED AND PAID:
Per unit (basic) (in usd per share)	$ 0.58	$ (0.15)
Per unit (diluted) (in usd per share)	$ 0.58	$ (0.15)