Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 558	$ 1,455
Accounts receivable, net	23,716	35,683
Receivables from related parties, net	1,110	1,043
Other current assets	8,692	9,345
Total current assets	34,076	47,526
Property, plant and equipment, net of accumulated depreciation of $263,554 and $274,404 at December 31, 2018 and 2019, respectively	232,777	248,261
Goodwill	6,728	6,728
Debt issuance costs, net	2,344	3,349
Operating lease assets	10,758
Intangibles assets, net	14,088	16,834
Other noncurrent assets	1,169	606
Total assets	301,940	323,304
Current liabilities:
Accounts payable	3,125	3,707
Accounts payable to related parties	2,460	2,263
Contingent liability with related party (Note 12)	12,221
Accrued interest payable	293	465
Accrued property taxes payable	3,247	3,089
Accrued payroll	4,823	3,667
Current operating lease liability	2,391
Other current liabilities	2,627	3,465
Total current liabilities	54,576	48,865
Other long-term liabilities	2,417	4,010
Contingent liability with related party (Note 12)		10,019
Noncurrent operating lease liability	8,529
Long-term debt	255,592	265,592
Commitments and contingencies (Note 15)
Partners’ capital (deficit):
Common unitholders (40,424,372 and 40,830,051 units issued and outstanding at December 31, 2018 and 2019, respectively)	356,777	370,972
Preferred Units (35,125,202 units issued and outstanding at both dates)	253,923	253,923
General partner interest (1.6% interest with 1,225,409 general partner units outstanding at both dates)	(632,023)	(631,791)
Total partners’ capital (deficit)	(21,323)	(6,896)
Total liabilities and partners’ capital (deficit)	301,940	323,304
Third Party [Member]
Current liabilities:
Accrued crude oil purchases	6,706	13,949
Unearned revenue	1,942	3,206
Related Party [Member]
Current liabilities:
Accrued crude oil purchases	11,807	10,219
Unearned revenue	2,934	4,835
Long-term unearned revenue with related parties	$ 2,149	$ 1,714