CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 104,104	$ 70,647
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	57,558	58,862
Accretion of asset retirement obligations	554	542
Amortization of deferred charges	516	422
(Gain) loss on commodity derivative instruments	11,996	49,680
Net cash (paid) received on settlement of commodity derivative instruments	4,674	(10,665)
Equity-based compensation	13,039	15,350
Exploratory dry hole expense	3	6,743
Increase (Decrease) In Deferred Rent		321
(Gain) loss on sale of assets, net	0	(2)
Changes in operating assets and liabilities:
Accounts receivable	17,212	(17,915)
Prepaid expenses and other current assets	(976)	(428)
Accounts payable, accrued liabilities, and other	(7,405)	2,826
Settlement of asset retirement obligations	(299)	(57)
NET CASH PROVIDED BY OPERATING ACTIVITIES	200,976	176,326
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of oil and natural gas properties	(40,676)	(56,069)
Additions to oil and natural gas properties	(50,121)	(73,675)
Additions to oil and natural gas properties leasehold costs	(871)	(3,799)
Purchases of other property and equipment	(2,152)	(5)
Proceeds from the sale of oil and natural gas properties	320	1,255
Proceeds from farmouts of oil and natural gas properties	47,487	41,034
NET CASH USED IN INVESTING ACTIVITIES	(46,013)	(91,259)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common units, net of offering costs	(43)	9,067
Distributions to noncontrolling interests	0	(114)
Distribution equivalents paid	(2,982)	0
Redemptions of Series A redeemable preferred units	0	(2,115)
Borrowings under credit facility	172,500	175,000
Repayments under credit facility	(146,500)	(142,000)
Debt issuance costs and other	0	(755)
NET CASH USED IN FINANCING ACTIVITIES	(156,471)	(83,638)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(1,508)	1,429
CASH AND CASH EQUIVALENTS – beginning of the period	5,414	5,642
CASH AND CASH EQUIVALENTS – end of the period	3,906	7,071
SUPPLEMENTAL DISCLOSURE
Interest paid	10,618	9,364
Common and Subordinated Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	(152,030)	(105,785)
Repurchases of common and subordinated units	(16,916)	(9,071)
Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	0	(690)
Series B cumulative convertible preferred units on an as-converted basis | Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	$ (10,500)	$ (7,175)