Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders		$ 196,322	$ 175,006	$ 784,022	$ 503,496
Participating Securities Share in Earnings		567	471	2,245	1,416
Net income attributable to common shares		$ 195,755	$ 174,535	$ 781,777	$ 502,080
Average number of shares of common stock outstanding		187,208	197,261	191,182	197,895
Effect of dilutive variable restricted shares and performance share units	[1]	136	274	100	201
Average number of shares of common stock outstanding assuming dilution		187,344	197,535	191,282	198,096
Basic earnings per share		$ 1.05	$ 0.88	$ 4.09	$ 2.54
Diluted earnings per share		$ 1.04	$ 0.88	$ 4.09	$ 2.53
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		263	195	335	214

[1] (1) Excludes anti-dilutive restricted and performance share units of: 263,000 195,000 335,000 214,000