Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 19,231	$ (137,056)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	21,900	13,250
Amortization of debt issuance costs	507	1,338
Revisions to asset retirement obligation included in DD&A	(1,859)	(1,518)
Asset impairments	7,646	123,860
Accretion of plugging and abandonment liability	1,127	1,099
Distributions (return on investment) from equity investments	2,950	47
Equity earnings in affiliate	(2,381)	(80)
Bad debt expense	35	122
Dryhole/exploration expense		1,866
(Gain)/Loss from disposition of property and equipment	210	(111)
Total mark-to-market on commodity derivative contracts	7,239	(25,149)
Cash settlements on commodity derivative contracts	18,780	18,996
Unit-based compensation	2,044	2,454
(Gain) loss on embedded derivatives	(47,794)	9,982
Amortization of intangible assets	13,756	2,805
Costs for plug and abandon activities	(182)	(186)
Changes in Operating Assets and Liabilities:
Accounts receivable	(159)	4,166
Accounts receivable - related entities	(4,472)	(1,515)
Prepaid expenses	(1,297)	1,039
Other assets	730	300
Accounts payable and accrued liabilities	(3,876)	(862)
Accounts payable - related entities	6,011	1,035
Royalties payable	17	(445)
Net cash provided by operating activities	40,163	15,437
Cash flows from investing activities:
Cash paid for acquisitions	(25,622)	(427,218)
Development of oil and natural gas properties	(939)	(2,005)
Proceeds from sale of assets	38	470
Construction of gathering and transportation assets	(4,730)
Purchases of equity affiliate	(107,271)	13
Net cash used in investing activities	(138,524)	(428,740)
Cash flows from financing activities:
Proceeds from issuance of preferred units		359,500
Payments for offering costs	(5,403)	(1,756)
Proceeds from issuance of debt	72,000	107,000
Repayment of debt	(26,000)	(42,500)
Issuance of common units	99,196	193
Repurchase of common units under repurchase program	(2,948)	(2,223)
Units tendered by employees for tax withholdings	(140)	(618)
Distributions to common unitholders	(6,696)	(1,219)
Class B preferred unit cash distributions	(37,168)
Debt issuance costs	(94)	(2,741)
Net cash provided by financing activities	92,747	415,636
Net increase (decrease) in cash and cash equivalents	(5,614)	2,333
Cash and cash equivalents, beginning of period	6,571	4,238
Cash and cash equivalents, end of period	957	6,571
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	1,119	1,684
Acquisition of oil and natural gas properties in exchange for common units		935
Cash paid during the period for interest	4,449	2,380
Cash paid during the period for income taxes		$ 53
Transfer of embedded derivative to Class B preferred units	$ 145,283