Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Earnings Per Share [Abstract]
Earnings attributable to HollyFrontier stockholders	$ 256,981		$ 493,499		$ 590,650		$ 735,195
Participating securities' share in earnings	917		2,257		2,201		3,116
Net income attributable to common shares	$ 256,064		$ 491,242		$ 588,449		$ 732,079
Average number of shares of common stock outstanding	201,543,000		205,727,000		202,131,000		207,129,000
Effect of dilutive variable restricted shares and performance share units	362,000	[1]	754,000	[1]	354,000	[1]	809,000	[1]
Average number of shares of common stock outstanding assuming dilution	201,905,000		206,481,000		202,485,000		207,938,000
Basic earnings per share	$ 1.27		$ 2.40		$ 2.91		$ 3.55
Diluted earnings per share	$ 1.27		$ 2.39		$ 2.91		$ 3.54
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	232		0		248		0

[1] (1) Excludes anti-dilutive restricted and performance share units of: 232 — 248 —