Consolidated Statements of Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues	$ 19,828,155	$ 19,151,455	$ 20,138,687
Cost and expenses:
Cost of sales, excluding depreciation	18,514,054	17,803,314	18,269,078
Operating expenses, excluding depreciation	880,701	812,652	738,824
General and administrative expenses	140,150	95,794	120,443
(Gain) loss on sale of assets	(895)	(183)	(2,329)
Depreciation and amortization expense	178,996	111,479	92,238
Total cost and expenses	19,713,006	18,823,056	19,218,254
Income from operations	115,149	328,399	920,433
Other income (expense)
Change in fair value of contingent consideration	0	0	(2,768)
Change in fair value of catalyst lease	3,969	4,691	(3,724)
Interest expense, net	(98,001)	(94,214)	(108,629)
Net Income	$ 21,117	$ 238,876	$ 805,312