Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net loss	$ (10,757)	$ (19,082)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	9,500	11,885
Debt issuance costs amortization	680	674
Accretion of discount on asset retirement obligations	244	316
Impairment of proved oil and natural gas properties	17,672	895
Impairment of proved oil and natural gas properties sold	0	3,578
Loss on settlements of asset retirement obligations	5	0
Cash paid for settlements of asset retirement obligations	(21)
(Gain) loss on derivatives, net	(5,665)	7,520
Cash settlements received for matured derivatives	201	17,285
Cash premiums paid for derivatives, net	(2,571)	(2,257)
Gain on sale of oil and natural gas properties	0	(13)
Non-cash equity-based compensation	335	650
Changes in operating assets and liabilities:
Accounts receivable	1,048	(682)
Other receivables	150	3,822
Prepaids and other	224	146
Accounts payable - trade and accrued liabilities	308	1,032
Accounts payable - related parties	(2,027)	(870)
Net cash provided by operating activities	9,326	24,899
Cash Flows from Investing Activities:
Acquisitions of oil and natural gas properties	(4,666)
Additions to oil and natural gas properties	(4,341)	(3,495)
Additions to other property and equipment	(133)
Proceeds from sale of oil and natural gas properties		7
Net cash used in investing activities	(9,140)	(3,488)
Cash Flows from Financing Activities:
Proceeds from line of credit	4,000
Payments on line of credit	(5,000)	(17,982)
Offering costs	(59)	(16)
Debt issuance costs		(9)
Distributions to Class A convertible preferred units	(1,000)
Net cash used in financing activities	(2,059)	(18,007)
Net (decrease) increase in cash and cash equivalents	(1,873)	3,404
Beginning cash and cash equivalents	2,359	615
Ending cash and cash equivalents	$ 486	$ 4,019