Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders	$ (304,623)	$ 253,055
Participating securities’ (restricted stock) share in earnings	0	364
Net income (loss) attributable to common shares	$ (304,623)	$ 252,691
Average number of shares of common stock outstanding	161,873	170,851
Effect of dilutive variable restricted shares and performance share units	0	1,388
Average number of shares of common stock outstanding assuming dilution	161,873	172,239
Basic earnings (loss) per share	$ (1.88)	$ 1.48
Diluted earnings (loss) per share	$ (1.88)	$ 1.47
Excludes anti-dilutive restricted and performance share units of:	0	0