Other Comprehensive Income (Loss) (Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income (Loss) Components and Tax Effects [Line Items]
Net change in foreign currency translation adjustment, before Tax	$ (11,503)	$ 14,298	$ (23,443)	$ 7,585
Net unrealized gain (loss) on hedging instruments	1,521	1,232	(4,049)	5,276
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	0	0	0	(4)
Other comprehensive income (loss)	(9,982)	15,530	(27,492)	12,857
Less other comprehensive income attributable to noncontrolling interest		(67)		(17)
Other comprehensive income (loss) attributable to HollyFrontier stockholders	(9,982)	15,597	(27,492)	12,874
Net change in foreign currency translation adjustment, tax	(2,422)	4,433	(4,950)	2,654
Net unrealized gain (loss) on hedging instruments, tax expense (benefit)	388	503	(852)	2,048
Other comprehensive income (loss), tax expense	(2,034)	4,936	(9,536)	4,701
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax			(3,734)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax				(1)
Other comprehensive income (loss) attributable to HollyFrontier stockholders, tax expense	(2,034)	4,936	(9,536)	4,701
Net change in foreign currency translation, net of tax	(9,081)	9,865	(18,493)	4,931
Net unrealized gain (loss) on marketable securities, after tax				(3)
Net unrealized gain (loss) on hedging instruments, after tax	1,133	729	(3,197)	3,228
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			3,734
Other comprehensive income (loss), net of tax	(7,948)	10,594	(17,956)	8,156
Less other comprehensive income (loss) attributable to noncontrolling interest, after tax		(67)		(17)
Other comprehensive income (loss) attributable to HollyFrontier stockholders	$ (7,948)	$ 10,661	$ (17,956)	$ 8,173