Equity (Changes To Equity) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				$ 5,523,584
Net income		$ 373,187	$ 185,153	615,848	$ 349,115
Other comprehensive income (loss), net of tax		(3,547)	$ 20,923	(15,523)	74,223
Purchase of treasury stock				(320,132)	$ (20,135)
Balance at June 30, 2015		$ 5,603,059		$ 5,603,059
Shares Paid for Tax Withholding for Share Based Compensation				1,215
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		$ 734,900		$ 734,900
Stock Repurchase Program, Authorized Amount		$ 300,000		300,000
Shares Purchased under Accelerated Share Repurchase Forward Contract		5,500,000
Payments for Accelerated Stock Repurchase		$ (240,000)
Accelerated Stock Repurchase Forward Contract		(60,000)		(60,000)
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				587,700
Dividends				(125,192)
Distributions to noncontrolling interest holders				0
Other comprehensive income (loss), net of tax				(15,204)
Equity-based compensation				12,461
Tax attributable to equity-based compensation				(113)
Purchase of treasury stock	[1]			(380,177)
Purchase of units for incentive grants - HEP				0
Other				0
Balance at June 30, 2015		5,603,059		5,603,059
Noncontrolling Interest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at December 31, 2014				577,135
Net income				28,148
Dividends				0
Distributions to noncontrolling interest holders				(41,596)
Other comprehensive income (loss), net of tax				(319)
Equity-based compensation				1,761
Tax attributable to equity-based compensation				0
Purchase of treasury stock	[1]			0
Purchase of units for incentive grants - HEP				(247)
Other				14
Balance at June 30, 2015		564,896		564,896
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				615,848
Dividends				(125,192)
Distributions to noncontrolling interest holders				(41,596)
Other comprehensive income (loss), net of tax				(15,523)
Equity-based compensation				14,222
Tax attributable to equity-based compensation				(113)
Purchase of treasury stock	[1]			(380,177)
Purchase of units for incentive grants - HEP				(247)
Other				14
Balance at June 30, 2015		$ 6,167,955		$ 6,167,955

[1] Includes 1,215 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.