Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (374)	$ 1,442
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	3,064	3,263
Amortization of debt issuance costs	287	131
Accretion expense	133	126
Distributions from equity investments	4,658	6,992
Equity earnings in affiliate	(1,442)	(4,272)
Net loss on commodity derivative contracts	4,524	1,937
Net cash settlements received (paid) on commodity derivative contracts	477	(189)
Unit-based compensation	635	738
(Gain) loss on earnout derivative	(31)	270
Amortization of intangible assets	3,365	3,365
Changes in Operating Assets and Liabilities:
Accounts receivable	69	102
Accounts receivable - related entities	380	7,105
Prepaid expenses	(154)	66
Other assets	19	22
Accounts payable and accrued liabilities	661	5,591
Accounts payable and accrued liabilities- related entities	1,181	(3,570)
Royalties payable		(3)
Other long-term liabilities	(9)
Net cash provided by operating activities	17,443	23,116
Cash flows from investing activities:
Development of oil and natural gas properties		(3)
Proceeds from sale of assets		350
Construction of gathering and transportation assets	(197)	(1,160)
Purchases of and contributions to equity affiliates	(10)	(263)
Net cash used in investing activities	(207)	(1,076)
Cash flows from financing activities:
Payments for offering costs		(50)
Repayment of debt	(2,000)	(5,000)
Distributions to common unitholders	(2,471)	(6,746)
Class B preferred unit cash distributions	(8,838)	(8,750)
Debt issuance costs	(6)	(11)
Net cash used in financing activities	(13,315)	(20,557)
Net increase (decrease) in cash and cash equivalents	3,921	1,483
Cash and cash equivalents, beginning of period	2,934	321
Cash and cash equivalents, end of period	6,855	1,804
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	20	641
Cash paid during the period for interest	$ 2,582	$ 2,300