Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (137,056)	$ 9,503
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	13,250	17,533
Amortization of intangible assets	2,804
Asset impairments	123,861	5,424
Amortization of debt issuance costs	1,338	271
Dryhole/exploration expenses	1,866
Accretion expense	1,099	604
Revisions to asset retirement obligation included in DD&A	(1,518)
Equity earnings in affiliate	(80)	(216)
Distributions from equity affiliate	47
Gain (loss) from disposition of property and equipment	(111)	223
Bad debt expense	122	94
Total mark-to-market on commodity derivative contracts	(25,149)	(19,855)
Cash mark-to-market settlements on commodity derivative contracts	18,996	7,626
Unit-based compensation programs	2,454	1,298
Loss on embedded derivative	9,982
Costs for plug and abandon activities	(186)
Changes in Operating Assets and Liabilities:
Decrease in accounts receivable	4,166	1,370
Increase in accounts receivable - related entities	(1,515)
Decrease in accounts payable - related entities	1,035
Decrease in prepaid expenses	1,039	764
(Increase) decrease in other assets	300	2
Decrease in accounts payable/accrued liabilities	(862)	(7,534)
Decrease in royalty payable	(445)	(108)
Net cash provided by operating activities	15,437	16,999
Cash flows from investing activities:
Cash paid for acquisitions	(427,218)	(1,351)
Development of oil and natural gas properties	(2,005)	(5,865)
Proceeds from sale of assets	470	485
Distributions from equity affiliate	13	295
Net cash used in investing activities	(428,740)	(6,436)
Cash flows from financing activities:
Proceeds from issuance of preferred units	359,500
Payments for offering costs	(1,756)
Proceeds from issuance of debt	107,000	5,750
Repayment of debt	(42,500)	(13,950)
Issuance of common units	193
Members' cash contributions	(1,219)
Repurchase of common units under repurchase program	(2,223)
Units tendered by employees for tax withholdings	(618)	(415)
Repurchase of Class A, Class C and Class D interests		(2,468)
Debt issuance costs	(2,741)	(136)
Net cash provided by (used in) financing activities	415,636	(11,219)
Net increase (decrease) in cash and cash equivalents	2,333	(656)
Cash and cash equivalents, beginning of period	4,238	4,894
Cash and cash equivalents, end of period	6,571	4,238
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	1,684	(512)
Acquisition of oil and natural gas properties in exchange for common units	935
Cash paid during the period for interest	2,380	1,841
Cash paid during the period for income taxes	$ 53	$ (73)