Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 2,484	$ 321
Accounts receivable	152	495
Accounts receivable - related entities	6,648	13,099
Prepaid expenses	2,587	2,670
Fair value of derivative instruments	4	942
Total current assets	11,875	17,527
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	117,606	170,750
Gathering and transportation assets	185,615	184,969
Less: accumulated depreciation, depletion, amortization and impairment	(98,483)	(142,574)
Oil and natural gas properties and equipment, net	204,738	213,145
Other assets
Intangible assets, net	165,436	172,166
Fair value of derivative instruments	178	1,318
Equity investments	120,710	123,715
Other non-current assets	485	552
Total assets	503,422	528,423
Current liabilities
Accounts payable and accrued liabilities	4,405	1,782
Accounts payable and accrued liabilities - related entities	7,065	10,353
Royalties payable	370	371
Fair value of derivative instruments	2,049	756
Other liabilities	260	151
Total current liabilities	14,149	13,413
Other liabilities
Asset retirement obligation	6,264	6,074
Long-term debt, net of debt issuance costs	183,040	187,808
Fair value of derivative instruments	1,809	273
Other liabilities	7,666	6,251
Total other liabilities	198,779	200,406
Total liabilities	212,928	213,819
Commitments and contingencies (See Note 12)
Mezzanine equity
Class B preferred units, 31,000,887 units issued and outstanding as of June 30, 2018 and December 31, 2017	346,761	343,912
Partners' deficit
Common units, 16,000,554 and 14,965,134 units issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	(56,267)	(29,308)
Total partners' deficit	(56,267)	(29,308)
Total liabilities and partners' capital	$ 503,422	$ 528,423