Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to HollyFrontier stockholders	$ 253,055	$ 268,091
Participating securities’ (restricted stock) share in earnings	364	950
Net income (loss) attributable to common shares	$ 252,691	$ 267,141
Average number of shares of common stock outstanding	170,851	176,617
Effect of dilutive variable restricted shares and performance share units	1,388	1,337
Average number of shares of common stock outstanding assuming dilution	172,239	177,954
Basic earnings (loss) per share	$ 1.48	$ 1.51
Diluted earnings (loss) per share	$ 1.47	$ 1.50
Excludes anti-dilutive restricted and performance share units of:	0	5