Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 6,855	$ 2,934
Accounts receivable	85	277
Accounts receivable - related entities	6,316	6,700
Prepaid expenses	1,085	931
Fair value of commodity derivative instruments	536	3,044
Total current assets	14,877	13,886
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	112,346	112,173
Gathering and transportation assets	186,583	186,406
Less: accumulated depreciation, depletion, amortization and impairment	(103,297)	(100,245)
Oil and natural gas properties and equipment, net	195,632	198,334
Other assets
Intangible assets, net	155,341	158,706
Fair value of commodity derivative instruments	57	876
Equity investments	111,259	114,465
Other non-current assets	385	418
Total assets	477,551	486,685
Current liabilities
Accounts payable and accrued liabilities	4,000	4,678
Accounts payable and accrued liabilities - related entities	6,826	5,641
Royalties payable	359	359
Short-term debt, net of debt issuance costs	176,863
Fair value of commodity derivative instruments	800	6
Other liabilities	132	125
Total current liabilities	188,980	10,809
Other liabilities
Asset retirement obligation	6,505	6,200
Long-term debt, net of debt issuance costs		178,582
Fair value of commodity derivative instruments	713
Other liabilities	5,810	5,857
Total other liabilities	13,028	190,639
Total liabilities	202,008	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	350,554	349,857
Partners' deficit
Common units, 18,252,065 and 16,486,239 units issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	(75,011)	(64,620)
Total partners' deficit	(75,011)	(64,620)
Total liabilities and partners' capital	$ 477,551	$ 486,685