Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to HollyFrontier stockholders		$ 360,824	$ 176,429	$ 587,700	$ 328,490
Participating Securities Share in Earnings		1,036	475	1,677	945
Net income attributable to common shares		$ 359,788	$ 175,954	$ 586,023	$ 327,545
Average number of shares of common stock outstanding		191,355	198,139	193,202	198,217
Effect of dilutive variable restricted shares and performance share units	[1]	99	241	77	191
Average number of shares of common stock outstanding assuming dilution		191,454	198,380	193,279	198,408
Basic earnings per share		$ 1.88	$ 0.89	$ 3.03	$ 1.65
Diluted earnings per share		$ 1.88	$ 0.89	$ 3.03	$ 1.65
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		349	26	379	2

[1] (1) Excludes anti-dilutive restricted and performance share units of: 349,000 26,000 379,000 2,000