Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 1,804	$ 321
Accounts receivable	43	495
Accounts receivable - related entities	6,074	13,099
Prepaid expenses	2,604	2,670
Fair value of derivative instruments	447	942
Total current assets	10,972	17,527
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	171,041	170,750
Gathering and transportation assets	185,407	184,969
Less: accumulated depreciation, depletion, amortization and impairment	(145,825)	(142,574)
Oil and natural gas properties and equipment, net	210,623	213,145
Other assets
Intangible assets, net	168,801	172,166
Fair value of derivative instruments	790	1,318
Equity investments	121,258	123,715
Other non-current assets	518	552
Total assets	512,962	528,423
Current liabilities
Accounts payable and accrued liabilities	4,321	1,782
Accounts payable and accrued liabilities - related entities	6,891	10,353
Royalties payable	368	371
Fair value of derivative instruments	1,052	756
Other liabilities	127	151
Total current liabilities	12,759	13,413
Other liabilities
Asset retirement obligation	6,488	6,074
Long-term debt, net of debt issuance costs	182,928	187,808
Fair value of derivative instruments	662	273
Other liabilities	6,545	6,251
Total other liabilities	196,623	200,406
Total liabilities	209,382	213,819
Commitments and contingencies (See Note 12)
Mezzanine equity
Class B preferred units, 31,000,887 units issued and outstanding as of March 31, 2018 and December 31, 2017	344,443	343,912
Partners' capital (deficit)
Common units, 15,171,946 and 14,965,134 units issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	(40,863)	(29,308)
Total partners' (deficit)	(40,863)	(29,308)
Total liabilities and partners' capital	$ 512,962	$ 528,423