Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders	$ 226,876		$ 152,061
Participating Securities Share in Earnings	644		466
Net income attributable to common shares	$ 226,232		$ 151,595
Average number of shares of common stock outstanding	195,069		198,297
Effect of dilutive variable restricted shares and performance share units	52	[1]	627	[1]
Average number of shares of common stock outstanding assuming dilution	195,121		198,924
Basic earnings per share	$ 1.16		$ 0.76
Diluted earnings per share	$ 1.16		$ 0.76
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	412		14

[1] (1) Excludes anti-dilutive restricted and performance share units of: 412,000 14,000 — —