Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 5,277	$ (89,986)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	3,730	3,120
Amortization of intangible assets	3,458
Asset impairments	1,309	82,865
Amortization of debt issuance costs	123	239
Accretion expense	315	253
Equity earnings in affiliate	(12)	61
Gain from disposition of property and equipment		(59)
Bad debt expense	17	112
Total mark-to-market on commodity derivative contracts	(3,991)	(4,832)
Cash mark-to-market settlements on commodity derivative contracts	7,062	4,374
Unit-based compensation programs	862	1,992
Gain on embedded derivatives	(6,294)
Costs for plug and abandon activities	(17)
Changes in Operating Assets and Liabilities:
Decrease in accounts receivable	566	1,926
Increase in accounts receivable - related entities	(416)
Increase in accounts payable - related entities	2,006
Increase in prepaid expenses	(1,146)	(288)
Decrease in other assets	632	2
(Decrease) Increase in accounts payable/accrued liabilities	(2,810)	2,173
Decrease in royalties payable	(239)	(396)
Net cash provided by operating activities	10,432	1,556
Cash flows from investing activities:
Cash paid for acquisitions		(81,602)
Development of oil and natural gas properties	(1,084)	(954)
Proceeds from sale of assets	26	84
Net cash used in investing activities	(1,058)	(82,472)
Cash flows from financing activities:
Proceeds from issuance of preferred units		17,000
Payments for offering costs	(83)
Proceeds from issuance of debt	2,000	106,000
Repayment of debt		(42,500)
Repurchase of common units under repurchase program	(3,106)
Units tendered by employees for tax withholdings	(140)	(618)
Distributions to unitholders	(1,262)
Class B preferred cash distributions	(7,418)
Debt issuance costs		(969)
Net cash provided by (used in) financing activities	(10,009)	78,913
Net decrease in cash and cash equivalents	(635)	(2,003)
Cash and cash equivalents, beginning of period	6,571	4,238
Cash and cash equivalents, end of period	5,936	2,235
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	(738)	(149)
Acquisition of oil and natural gas properties in exchange for common units		2,000
Cash paid during the period for interest	$ 859	(405)
Cash paid during the period for income taxes		$ (2)