Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 3,325	$ (100,327)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	7,262	6,011
Amortization of intangible assets	6,917	188
Asset impairments	1,309	83,727
Amortization of debt issuance costs	246	324
Accretion expense	630	517
Revisions to asset retirement obligation included in DD&A	(862)
Equity earnings in affiliate	(12)	48
Gain from disposition of property and equipment	(9)	(113)
Bad debt expense	35	122
Total mark-to-market on commodity derivative contracts	3,736	1,066
Cash mark-to-market settlements on commodity derivative contracts	13,028	8,950
Unit-based compensation programs	1,952	2,388
Gain on embedded derivative	(13,192)
Costs for plug and abandon activities	(86)
Changes in Operating Assets and Liabilities:
Decrease in accounts receivable	313	1,721
Increase in accounts receivable - related entities	(5,836)	(1,582)
Increase in accounts payable - related entities	2,634
(Increase) decrease in prepaid expenses	(1,414)	408
(Increase) decrease in other assets	659	(981)
(Decrease) increase in accounts payable/accrued liabilities	(3,128)	2,788
Decrease in royalties payable	(190)	(399)
Net cash provided by operating activities	17,317	4,856
Cash flows from investing activities:
Cash paid for acquisitions		(81,378)
Development of oil and natural gas properties	(2,269)	(1,056)
Proceeds from sale of assets	16	344
Distributions from equity affiliate		15
Net cash used in investing activities	(2,253)	(82,075)
Cash flows from financing activities:
Proceeds from issuance of preferred units		17,375
Payments for offering costs	(87)	(810)
Proceeds from issuance of debt	2,000	106,000
Repayment of debt		(42,500)
Issuance of common units		52
Repurchase of common units under repurchase program	(2,948)
Units tendered by employees for tax withholdings	(140)	(618)
Distributions to unitholders	(3,025)
Class B preferred unit cash distributions	(16,168)
Debt issuance costs	(64)	(1,294)
Net cash provided by (used in) financing activities	(20,432)	78,205
Net increase (decrease) in cash and cash equivalents	(5,368)	986
Cash and cash equivalents, beginning of period	6,571	4,238
Cash and cash equivalents, end of period	1,203	5,224
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	(1,609)	(149)
Acquisition of oil and natural gas properties in exchange for common units		2,000
Cash paid during the period for interest	$ (1,732)	(1,154)
Cash paid during the period for income taxes		$ (2)