Equity (Changes To Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				$ 5,523,584
Net income		$ 210,607	$ 187,558	826,455	$ 536,673
Other comprehensive income (loss), net of tax		(5,681)	$ (4,756)	(21,204)	69,467
Purchase of treasury stock				(481,766)	$ (133,150)
Balance at September 30, 2015		$ 5,621,168		$ 5,621,168
Shares Paid for Tax Withholding for Share Based Compensation				3,030
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		$ 559,000		$ 559,000
Stock Repurchase Program, Authorized Amount						$ 300,000
Shares Purchased under Accelerated Share Repurchase Forward Contract		5,500,000
Accelerated share repurchase program settlement		1,200,000		1,200,000
Share Price		$ 44.81		$ 44.81
Holly Corporation Stockholders' Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				$ 5,523,584
Net income				784,022
Dividends				(187,372)
Distributions to noncontrolling interest holders				0
Other comprehensive income (loss), net of tax				(20,727)
Equity-based compensation				18,905
Tax attributable to equity-based compensation				(1,020)
Purchase of treasury stock	[1]			(496,224)
Purchase of units for incentive grants - HEP				0
Other				0
Balance at September 30, 2015		$ 5,621,168		5,621,168
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				577,135
Net income				42,433
Dividends				0
Distributions to noncontrolling interest holders				(61,366)
Other comprehensive income (loss), net of tax				(477)
Equity-based compensation				3,023
Tax attributable to equity-based compensation				0
Purchase of treasury stock	[1]			0
Purchase of units for incentive grants - HEP				(247)
Other				15
Balance at September 30, 2015		560,516		560,516
Stockholders' Equity, Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				6,100,719
Net income				826,455
Dividends				(187,372)
Distributions to noncontrolling interest holders				(61,366)
Other comprehensive income (loss), net of tax				(21,204)
Equity-based compensation				21,928
Tax attributable to equity-based compensation				(1,020)
Purchase of treasury stock	[1]			(496,224)
Purchase of units for incentive grants - HEP				(247)
Other				15
Balance at September 30, 2015		$ 6,181,684		$ 6,181,684

[1] Includes 3,030 shares withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards.