Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 2,031	$ 957
Restricted cash	250
Accounts receivable	1,581	1,212
Accounts receivable - related entities	4,812	5,987
Prepaid expenses	2,608	2,041
Fair value of derivative instruments	5,993	4,568
Total current assets	17,275	14,765
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	757,705	758,913
Gathering and transportation assets	176,195	152,209
Material and supplies	1,056	1,056
Less: accumulated depreciation, depletion, amortization and impairment	(708,315)	(689,358)
Oil and natural gas properties and equipment, net	226,641	222,820
Other assets
Intangible assets, net	178,942	185,766
Fair value of derivative instruments	6,291	3,964
Equity investments	117,519	111,614
Other non-current assets	647	776
Total assets	547,315	539,705
Current liabilities
Accounts payable and accrued liabilities	1,244	951
Accounts payable and accrued liabilities - related entities	14,822	7,046
Royalties payable	535	706
Fair value of derivative instruments	21	740
Total current liabilities	16,622	9,443
Other liabilities
Asset retirement obligation	14,227	13,579
Long-term debt, net of debt issuance costs	176,554	151,322
Fair value of derivative instruments		1,356
Other liabilities	4,049	4,270
Total other liabilities	194,830	170,527
Total liabilities	211,452	179,970
Commitments and contingencies (See Note 11)
Mezzanine equity
Class B preferred units, 31,000,887 and 29,296,441 units issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	342,953	342,991
Partners' capital (deficit)
Common units, 14,606,028 and 13,447,749 units issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	(7,090)	16,744
Total partners' capital (deficit)	(7,090)	16,744
Total liabilities and partners' capital	$ 547,315	$ 539,705