Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Current Interest Rate Swap Interest_Rate_Swaps	Dec. 31, 2013 HEP Interest Rate Contract	Dec. 31, 2013 HEP Current Interest Rate Swap	Dec. 31, 2013 Holly Credit Agreement HEP	Dec. 31, 2013 February 2016 Maturity Date HEP Interest Rate Contract	Dec. 31, 2013 July 2017 Maturity Date HEP Interest Rate Contract
Derivative [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	$ 4,300,000
Number of derivative instruments		3
Credit agreement advance					305,000,000	155,000,000	150,000,000.0
Fixed interest rate			0.74%	0.99%
Rate added to fixed base rate			2.00%
Effective interest rate on debt			2.74%	2.99%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(44,300,000)
Net unrealized loss transferred to income statement	$ 22,200,000
Gain (loss) on derivatives reclassified from accumulated OCI to income, period	12 months