Holly-Frontier Merger (Schedule Of Pro Forma Revenues And Net Income) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Combination, Description [Abstract]
Sales and other revenues	$ 19,418,709	$ 14,207,835
Net income attributable to HollyFrontier stockholders	$ 1,335,257	$ 179,979
Basic earnings per share (in dollars per share)	$ 6.37	$ 0.86
Diluted earnings per share (in dollars per share)	$ 6.35	$ 0.86