CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 115,757	$ (10,061)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	55,279	50,923
Impairment of oil and natural gas properties	0	6,775
Accretion of asset retirement obligations	500	474
Amortization of deferred charges	436	394
(Gain) loss on commodity derivative instruments	(44,728)	20,107
Net cash received on settlement of commodity derivative instruments	7,359	33,918
Equity-based compensation	10,939	25,139
(Gain) loss on sale of assets, net	(931)	(4,772)
Changes in operating assets and liabilities:
Accounts receivable	(4,318)	(6,585)
Prepaid expenses and other current assets	(729)	(1,003)
Accounts payable and accrued liabilities	658	(31,859)
Deferred revenue	(969)	221
Settlement of asset retirement obligations	(89)	(127)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	139,164	83,544
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of oil and natural gas properties	(66,501)	(136,340)
Additions to oil and natural gas properties	(33,903)	(36,710)
Purchase of other property and equipment	(96)	(5)
Proceeds from the sale of oil and natural gas properties	2,133	177
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(98,367)	(172,878)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under senior line of credit	159,500	230,000
Repayments of borrowings under senior line of credit	(82,500)	(11,000)
Distributions to non-controlling interests	(66)	(54)
Proceeds from issuance of common units	991	0
Payments for capitalized offering costs	0	(301)
Redemptions of redeemable preferred units	(19,641)	(18,461)
Loan origination fees	(50)	0
Repurchases of common and subordinated units	(7,845)	(24,696)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(43,082)	85,871
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,285)	(3,463)
CASH AND CASH EQUIVALENTS - beginning of the period	9,772	13,233
CASH AND CASH EQUIVALENTS - end of the period	7,487	9,770
SUPPLEMENTAL DISCLOSURE
Interest paid	7,062	1,928
Common and Subordinated Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	(91,019)	(85,866)
Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	$ (2,452)	$ (3,751)