Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 1,253	$ 2,934
Accounts receivable	167	277
Accounts receivable - related entities	6,520	6,700
Prepaid expenses	1,432	931
Fair value of commodity derivative instruments	661	3,044
Total current assets	10,033	13,886
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	112,449	112,173
Gathering and transportation assets	186,845	186,406
Less: accumulated depreciation, depletion, amortization and impairment	(106,094)	(100,245)
Oil and natural gas properties and equipment, net	193,200	198,334
Other assets
Intangible assets, net	151,976	158,706
Fair value of commodity derivative instruments	59	876
Equity investments	108,776	114,465
Other non-current assets	352	418
Total assets	464,396	486,685
Current liabilities
Accounts payable and accrued liabilities	3,964	4,678
Accounts payable and accrued liabilities - related entities	5,821	5,641
Royalties payable	359	359
Short-term debt, net of debt issuance costs	171,153
Fair value of commodity derivative instruments	541	6
Other liabilities	139	125
Total current liabilities	181,977	10,809
Other liabilities
Asset retirement obligation	6,631	6,200
Long-term debt, net of debt issuance costs		178,582
Fair value of commodity derivative instruments	157
Other liabilities	5,802	5,857
Total other liabilities	12,590	190,639
Total liabilities	194,567	201,448
Commitments and contingencies (See Note 12)
Mezzanine equity
Class B preferred units, 31,310,896 units issued and outstanding as of March 31, 2019 and December 31, 2018	353,067	349,857
Partners' deficit
Common units, 19,188,086 and 16,486,239 units issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	(83,238)	(64,620)
Total partners' deficit	(83,238)	(64,620)
Total liabilities and partners' capital	$ 464,396	$ 486,685