Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (7,659)	$ 5,277
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	8,769	3,730
Amortization of debt issuance costs	128	123
Asset impairments	4,688	1,309
Accretion expense	258	315
Distributions from equity investments	2,010
Equity earnings in affiliate	(482)	(12)
Bad debt expense		17
Total mark-to-market on commodity derivative contracts	(6,055)	(3,991)
Cash settlements on commodity derivative contracts	1,513	7,062
Unit-based compensation expense	540	862
Gain on embedded derivative		(6,294)
Amortization of intangible assets	3,412	3,458
Costs for plug and abandon activities		(17)
Changes in Operating Assets and Liabilities:
Accounts receivable	43	566
Accounts receivable - related entities	2,951	(416)
Prepaid expenses	(20)	(1,146)
Other assets	83	632
Accounts payable and accrued liabilities	(3,092)	(2,810)
Accounts payable and accrued liabilities - related entities	6,226	2,006
Royalties payable	248	(239)
Net cash provided by operating activities	13,561	10,432
Cash flows from investing activities:
Final settlement of oil and natural gas properties acquisition	1,468
Development of oil and natural gas properties	(143)	(1,084)
Proceeds from sale of assets		26
Construction of gathering and transportation assets	(5,786)
Purchases of equity affiliates	(2,122)
Net cash used in investing activities	(6,583)	(1,058)
Cash flows from financing activities:
Payments for offering costs	(120)	(83)
Proceeds from issuance of debt	7,500	2,000
Repurchase of common units under repurchase program		(3,106)
Units tendered by employees for tax withholdings		(140)
Distributions to common unitholders	(5,796)	(1,262)
Class B preferred unit cash distributions	(7,000)	(7,418)
Debt issuance costs	(26)
Net cash used in financing activities	(5,442)	(10,009)
Net increase (decrease) in cash and cash equivalents	1,536	(635)
Cash and cash equivalents, beginning of period	957	6,571
Cash and cash equivalents, end of period	2,493	5,936
Supplemental disclosures of cash flow information:
Change in accrued capital expenditures	7,158	738
Asset retirement obligation	195
Earnout liability	221
Cash paid during the period for interest	$ 1,473	$ 859