Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 367	$ 957
Accounts receivable	731	1,212
Accounts receivable - related entities	6,729	5,987
Prepaid expenses	2,389	2,041
Fair value of derivative instruments	2,114	4,568
Total current assets	12,330	14,765
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	200,471	758,913
Gathering and transportation assets	183,681	152,209
Material and supplies		1,056
Less: accumulated depreciation, depletion, amortization and impairment	(162,403)	(689,358)
Oil and natural gas properties and equipment, net	221,749	222,820
Other assets
Intangible assets, net	175,530	185,766
Fair value of derivative instruments	3,187	3,964
Equity investments	120,303	111,614
Other non-current assets	585	776
Total assets	533,684	539,705
Current liabilities
Accounts payable and accrued liabilities	364	951
Accounts payable and accrued liabilities - related entities	6,482	7,046
Royalties payable	371	706
Fair value of derivative instruments	16	740
Total current liabilities	7,233	9,443
Other liabilities
Asset retirement obligation	7,796	13,579
Long-term debt, net of debt issuance costs	187,686	151,322
Fair value of derivative instruments	22	1,356
Other liabilities	4,049	4,270
Total other liabilities	199,553	170,527
Total liabilities	206,786	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 September 30, 2017 and December 31, 2016, respectively	343,416	342,991
Partners' capital (deficit)
Common units, 14,773,192 and 13,447,749 units issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	(16,518)	16,744
Total partners' capital (deficit)	(16,518)	16,744
Total liabilities and partners' capital	$ 533,684	$ 539,705