Equity (Changes To Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest	$ 563,282		$ 563,282		$ 526,111
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6,403,643		6,403,643		$ 5,896,940
Balance at December 31, 2017			5,370,829
Net income (loss)	362,913	$ 74,073	651,775	$ 36,291
Dividends			(117,500)
Distributions to noncontrolling interest holders			(60,759)
Other comprehensive income (loss), net of tax	(7,948)	$ 10,594	(17,956)	8,156
Allocated equity on common unit issuances, net of tax			100,464
Equity-based compensation			17,306
Purchase of treasury stock			(55,550)
Purchase of units for incentive grants - HEP			(58)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments			(11,019)
Balance at June 30, 2018	$ 5,840,361		$ 5,840,361
Shares Paid for Tax Withholding for Share Based Compensation			12,469
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,000,000,000		1,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 123,700		$ 123,700
Holly Corporation Stockholders' Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2017			5,370,829
Net income (loss)			613,598
Dividends			(117,500)
Distributions to noncontrolling interest holders			0
Other comprehensive income (loss), net of tax			(17,956)
Allocated equity on common unit issuances, net of tax			42,201
Equity-based compensation			15,758
Purchase of treasury stock			(55,550)	$ 0
Purchase of units for incentive grants - HEP			0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments			(11,019)
Balance at June 30, 2018	5,840,361		5,840,361
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest	$ 563,282		563,282
Net income (loss)			38,177
Dividends			0
Distributions to noncontrolling interest holders			(60,759)
Other comprehensive income (loss), net of tax			0
Allocated equity on common unit issuances, net of tax			58,263
Equity-based compensation			1,548
Purchase of treasury stock			0
Purchase of units for incentive grants - HEP			(58)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments			$ 0