Other Comprehensive Income (Loss) (Components And Allocated Tax Effects Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign currency translation adjustment	$ 22,151	$ 0	$ 0
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	7,774
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	14,377
Net unrealized gain (loss) on marketable securities, before tax	(4)	104	38
Net Unrealized gain (loss) on available-for-sale securities, tax expense (benefit)	(1)	40	14
Net unrealized gain (loss) on available-for-sale securities, after-tax	(3)	64	24
Net Unrealized Gain (Loss) on Hedging Activities, Before-Tax	14,447	25,040	(52,259)
Net Unrealized Gain (Loss) on Hedging Activities, Tax	5,613	9,713	(20,282)
Net Unrealized Gain (Loss) on Hedging Activities, Net of Tax	8,834	15,327	(31,977)
Net change in other post-retirement benefit obligations, before tax	(5,807)	(1,113)	79
Net change in other post-retirement benefit obligations, tax	(2,037)	(431)	31
Net change in other post-retirement benefit obligations, after tax	(3,770)	(682)	48
Other comprehensive income (loss) before income taxes	30,787	24,031	(52,142)
Other comprehensive income (loss), Tax Expense (Benefit)	11,349	9,322	(20,237)
Other comprehensive income (loss)	19,438	14,709	(31,905)
Less other comprehensive income (loss) attributable to noncontrolling interest, Before-Tax	(57)	(58)	144
Less other comprehensive income (loss) attributable to noncontrolling interest, Tax Expense (Benefit)	0	0	0
Less other comprehensive income (loss) attributable to noncontrolling interest, After-Tax	(57)	(58)	144
Other comprehensive income (loss) attributable to HollyFrontier stockholders, Before-Tax	30,844	24,089	(52,286)
Other comprehensive income (loss) attributable to HollyFrontier stockholders, Tax Expense (Benefit)	11,349	9,322	(20,237)
Other comprehensive income (loss) attributable to HollyFrontier stockholders, After-Tax	$ 19,495	$ 14,767	$ (32,049)