Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders		$ 21,253	$ 226,876
Participating Securities Share in Earnings		216	644
Net income attributable to common shares		$ 21,037	$ 226,232
Average number of shares of common stock outstanding		176,737	195,069
Effect of dilutive variable restricted shares and performance share units	[1]	47	52
Average number of shares of common stock outstanding assuming dilution		176,784	195,121
Basic earnings per share		$ 0.12	$ 1.16
Diluted earnings per share		$ 0.12	$ 1.16
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		177	412

[1] (1) Excludes anti-dilutive restricted and performance share units of: 177,000 412,000