CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 174,351	$ 131,422
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	84,933	88,135
Accretion of asset retirement obligations	829	820
Amortization of deferred charges	779	653
(Gain) loss on commodity derivative instruments	(12,294)	68,194
Net cash (paid) received on settlement of commodity derivative instruments	18,320	(20,461)
Equity-based compensation	16,906	24,947
Exploratory dry hole expense	3	6,784
Deferred rent		802
(Gain) loss on sale of assets, net	0	(2)
Changes in operating assets and liabilities:
Accounts receivable	28,454	(29,989)
Prepaid expenses and other current assets	(471)	7
Accounts payable, accrued liabilities, and other	(5,172)	18,515
Settlement of asset retirement obligations	(328)	(108)
NET CASH PROVIDED BY OPERATING ACTIVITIES	306,310	289,719
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of oil and natural gas properties	(42,969)	(106,390)
Additions to oil and natural gas properties	(63,606)	(119,676)
Additions to oil and natural gas properties leasehold costs	(933)	(4,639)
Purchases of other property and equipment	(2,452)	(15)
Proceeds from the sale of oil and natural gas properties	550	8,390
Proceeds from farmouts of oil and natural gas properties	60,577	78,605
NET CASH USED IN INVESTING ACTIVITIES	(48,833)	(143,725)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common units, net of offering costs	(43)	38,369
Distributions to noncontrolling interests	0	(161)
Distribution equivalents paid	(2,982)	0
Redemptions of Series A redeemable preferred units	0	(2,115)
Borrowings under credit facility	252,500	264,500
Repayments under credit facility	(249,500)	(250,500)
Debt issuance costs and other	0	(754)
NET CASH USED IN FINANCING ACTIVITIES	(260,925)	(147,195)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(3,448)	(1,201)
CASH AND CASH EQUIVALENTS – beginning of the period	5,414	5,642
CASH AND CASH EQUIVALENTS – end of the period	1,966	4,441
SUPPLEMENTAL DISCLOSURE
Interest paid	15,854	14,607
Common and Subordinated Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	(228,234)	(174,348)
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	$ (15,750)	$ (12,425)