Other Comprehensive Income (Loss) (Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Comprehensive Income (Loss) Components and Tax Effects [Line Items]
Net change in foreign currency translation adjustment, before Tax	$ 8,325	$ 16,702	$ (15,118)	$ 24,287
Net unrealized gain (loss) on hedging instruments	5,792	3,291	1,742	8,567
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	0	0	0	(4)
Other comprehensive income (loss)	14,117	19,993	(13,376)	32,850
Less other comprehensive income attributable to noncontrolling interest		(40)		(57)
Other comprehensive income (loss) attributable to HollyFrontier stockholders	14,117	20,033	(13,376)	32,907
Net change in foreign currency translation adjustment, tax	(1,354)	5,851	(6,304)	8,505
Net unrealized gain (loss) on hedging instruments, tax expense (benefit)	1,478	1,289	625	3,337
Other comprehensive income (loss), tax expense	124	7,140	(9,413)	11,841
Net change in pension and other post-retirement benefit obligations,Tax			(3,734)
Net unrealized gain (loss) on marketable securities, tax				(1)
Other comprehensive income (loss) attributable to HollyFrontier stockholders, tax expense	124	7,140	(9,413)	11,841
Net change in foreign currency translation, net of tax	9,679	10,851	(8,814)	15,782
Net unrealized gain (loss) on marketable securities, after tax				(3)
Net unrealized gain (loss) on hedging instruments, after tax	4,314	2,002	1,117	5,230
Net change in pension and other post-retirement benefit obligations, after Tax			3,734
Other comprehensive income (loss), net of tax	13,993	12,853	(3,963)	21,009
Less other comprehensive income (loss) attributable to noncontrolling interest, after tax		(40)		(57)
Other comprehensive income (loss) attributable to HollyFrontier stockholders	$ 13,993	$ 12,893	$ (3,963)	$ 21,066