Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 32,132	$ (92,532)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	11,341	9,050
Amortization of debt issuance costs	377	413
Revisions to asset retirement obligation included in DD&A	(862)
Asset impairments	1,309	84,664
Accretion of plugging and abandonment liability	901	782
Distributions (return on investment) from equity investments	750
Equity earnings in affiliate	(1,135)	(2)
Bad debt expense	35	122
(Gain)/Loss from disposition of property and equipment	210	(111)
Total mark-to-market gains (losses) on commodity derivative contracts	2,664	(16,256)
Cash mark-to-market settlements on commodity derivative contracts	17,361	13,441
Cash settlements on terminated commodity derivatives	3,197
Premiums paid on derivative contracts	(3,197)
LTIP unit compensation	2,042	2,463
Gain on embedded derivative	(43,204)
Amortization of intangible assets	10,345
Costs for plug and abandon activities	(142)
Changes in Operating Assets and Liabilities:
Decrease in accounts receivable	872	1,820
(Increase) decrease in accounts receivable - related entities	(5,025)	278
Increase in accounts payable - related entities	2,760
(Increase) decrease in prepaid expenses	(1,505)	675
(Increase) decrease in other assets	682	(867)
(Decrease) increase in accounts payable/accrued liabilities	(962)	5,195
Decrease in royalties payable	(112)	(454)
Net cash provided by operating activities	30,834	8,681
Cash flows from investing activities:
Cash paid for acquisitions		(81,378)
Development of oil and natural gas properties	(2,706)	(1,313)
Proceeds from sale of assets	38	470
Purchases of equity affiliate	(40,002)	60
Net cash used in investing activities	(42,670)	(82,161)
Cash flows from financing activities:
Proceeds from issuance of preferred units	(87)	17,375
Payments for offering costs	(226)	(810)
Proceeds from issuance of debt	39,000	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	(4,815)
Class B preferred unit cash distributions	(24,918)
Debt issuance costs		(1,294)
Net cash provided by financing activities	5,866	78,205
Net increase (decrease) in cash and cash equivalents	(5,970)	4,725
Cash and cash equivalents, beginning of period	6,571	4,238
Cash and cash equivalents, end of period	601	8,963
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	(1,562)	(149)
Acquisition of oil and natural gas properties in exchange for common units		2,000
Cash paid during the period for interest	$ (3,085)	(1,973)
Cash paid during the period for income taxes		$ (2)