CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Service revenue:
Third-party revenue	$ 15,886	$ 17,318
Related-party revenue	4,219	6,321
Lease revenue:
Third-party revenue	9,763	9,804
Related-party revenue	4,940	7,703
Product sales revenue:
Third-party revenue	58,924	3,514
Total revenue	93,732	44,660
Costs and expenses:
Operating expense	27,243	31,135
Cost of product sales from related party	24,587	2,637
Cost of product sales	30,774	0
General and administrative expense	3,693	4,221
Asset impairment expense	1,119	616
Total costs and expenses	87,416	38,609
Gain (loss) on sale of assets	1,724	(236)
Operating income	8,040	5,815
Other income (expenses):
Gain on sale of unconsolidated affiliate	0	2,225
Interest expense	(4,271)	(3,569)
Income before income taxes	3,769	4,471
Provision for income taxes	12	29
Net income	3,757	4,442
Allocation of net income for calculation of earnings per unit:
General partner interest in net income	105	231
Preferred interest in net income	6,279	6,278
Net income (loss) available to limited partners	$ (2,627)	$ (2,067)
Basic and diluted net income (loss) per common unit	$ (0.06)	$ (0.05)
Weighted average common units outstanding - basic and diluted	40,678	40,289