Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues	$ 3,217,640	$ 5,260,003	$ 9,763,440	$ 15,308,155
Costs and expenses:
Cost of sales, excluding depreciation	2,858,409	4,685,652	8,414,423	13,776,574
Operating expenses, excluding depreciation	200,014	200,858	625,542	679,538
General and administrative expenses	47,802	34,786	116,115	103,505
(Gain) loss on sale of assets	(142)	18	(1,133)	(162)
Depreciation and amortization expense	46,484	67,686	139,757	135,417
Total cost and expenses	3,152,567	4,989,000	9,294,704	14,694,872
Income from operations	65,073	271,003	468,736	613,283
Other income (expenses)
Change in fair value of catalyst leases	4,994	5,543	8,982	1,204
Interest expense, net	(21,888)	(24,031)	(65,915)	(75,704)
Net income	$ 48,179	$ 252,515	$ 411,803	$ 538,783