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Stock-Based Compensation (Summary Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
In Thousands, except Share data
9 Months Ended
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Outstanding at January 1, 2011 (non-vested), Grants693,992
Granted, Grants1,034,738[1]
Vesting and transfer of ownership to recipients, Grants(510,730)
Forfeited, Grants(26,934)
Outstanding at September 30, 2011 (non-vested), Grants1,191,066
Outstanding at January 1, 2011 (non-vested), Weighted-Average Grant Date Fair Value 14.65
Granted, Weighted-Average Grant Date Fair Value 29.54[1]
Vesting and transfer of ownership to recipients, Weighted - Average Grant Date Fair Value 17.25
Forfeited, Weighted-Average Grant Date Fair Value 26.08
Outstanding at September 30, 2011 (non-vested), Weighted-Average Grant Date Fair Value 26.22
Outstanding at September 30, 2011 (non-vested), Aggregate Intrinsic Value 31,226
Holly Frontier [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 
Granted, Grants480,876
[1]Includes 480,876 non-vested performance share grants under the legacy Frontier plan that were outstanding and retained by HollyFrontier at July 1, 2011.