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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) attributable to HollyFrontier stockholders		$ (409,368)	$ 360,824	$ (388,115)	$ 587,700
Participating securities’ share in earnings		216	1,036	432	1,677
Net income(loss) attributable to common shares		$ (409,584)	$ 359,788	$ (388,547)	$ 586,023
Average number of shares of common stock outstanding		175,865	191,355	176,301	193,202
Effect of dilutive variable restricted shares and performance share units	[1]	0	99	0	77
Average number of shares of common stock outstanding assuming dilution		175,865	191,454	176,301	193,279
Basic earnings (loss) per share		$ (2.33)	$ 1.88	$ (2.20)	$ 3.03
Diluted earnings (loss) per share		$ (2.33)	$ 1.88	$ (2.20)	$ 3.03
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0	349	0	379

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