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Stock-Based Compensation (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Petroleum_Refineries
Jun. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Share-based Compensation Plans | Petroleum_Refineries       2  
Share-based Compensation Expense $ 6,000   $ 6,100 $ 8,600 $ 12,500
HEP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Expense 500   $ 900 $ 1,200 $ 1,800
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   $ 16      
Total unrecognized compensation cost, weighted-average period of recognition, years       1 year 2 months  
Total unrecognized compensation cost related to non-vested grants 16,600     $ 16,600  
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement Vesting Period       1 year  
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement Vesting Period       3 years  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement Vesting Period       3 years  
Total unrecognized compensation cost, weighted-average period of recognition, years       1 year 5 months  
Total unrecognized compensation cost related to non-vested grants $ 10,200     $ 10,200