CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Footnotes) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Optimization revenues		$ 763	[1]	$ (168)	[2]	$ 3,450	[2]	$ (361)	[2]
General and administrative	[1]	27,780		19,346		57,827		43,839
Affiliates
Optimization revenues		340		0		988		0
Optimization cost of revenues - affiliates		24		0		36		0
General and administrative		$ 1,600		$ 6,100		$ 8,000		$ 13,400

[1] General and administrative expense includes general and administrative expense—affiliates of $1,600 and $6,100 for the three months ended June 30, 2018 and 2017, respectively, and $8,000 and $13,400 for the six months ended June 30, 2018 and 2017, respectively.

[2] Net asset optimization revenues (expenses) includes asset optimization revenues—affiliates of $340 and $0 for the three months ended June 30, 2018 and 2017, respectively, and asset optimization revenues—affiliates cost of revenues of $24 and $0 for the three months ended June 30, 2018 and 2017, respectively, and asset optimization revenues—affiliates of $988 and $0 for the six months ended June 30, 2018 and 2017, respectively, and asset optimization revenue—affiliates cost of revenues of $36 and $0 for the six months ended June 30, 2018 and 2017, respectively.