Fair Value Measurements (Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Assets, Fair Value Disclosure, Nonrecurring Basis	$ 44,400
Financial instruments, assets at carrying value	104,960	$ 184,889
Financial Liabilities Fair Value Disclosure	615,233	394,544
Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	115	3,469
Financial Liabilities Fair Value Disclosure	0
Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	104,845	181,420
Financial Liabilities Fair Value Disclosure	615,233	394,544
Marketable securities
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	81,328	144,019
Marketable securities | Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	0
Marketable securities | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	81,328	144,019
Nymex Futures Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	115	3,469
Nymex Futures Contracts [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	115	3,469
Nymex Futures Contracts [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	0	0
Commodity Contract [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	23,075	37,097
Financial Liabilities Fair Value Disclosure	47,082	98,930
Commodity Contract [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	23,075	37,097
Financial Liabilities Fair Value Disclosure	47,082	98,930
Forward Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	442
Financial Liabilities Fair Value Disclosure	933
Forward Contracts [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	442
Financial Liabilities Fair Value Disclosure	933
Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	265,313
Senior Notes [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	301,500	295,500
Senior Notes [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	265,313
Senior Notes [Member] | Level 2 [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	301,500	295,500
Interest Rate Swap [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value		304
Financial Liabilities Fair Value Disclosure	405	114
Interest Rate Swap [Member] | Level 2 [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value		304
Financial Liabilities Fair Value Disclosure	405	114
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	104,960	184,889
Financial Liabilities Fair Value Disclosure	591,730	395,796
Reported Value Measurement [Member] | Marketable securities
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	81,328	144,019
Reported Value Measurement [Member] | Nymex Futures Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	115	3,469
Reported Value Measurement [Member] | Commodity Contract [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	23,075	37,097
Financial Liabilities Fair Value Disclosure	47,082	98,930
Reported Value Measurement [Member] | Forward Contracts [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value	442
Financial Liabilities Fair Value Disclosure	933
Reported Value Measurement [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	246,174
Reported Value Measurement [Member] | Senior Notes [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	297,136	296,752
Reported Value Measurement [Member] | Interest Rate Swap [Member] | HEP [Member]
Debt Instrument [Line Items]
Financial instruments, assets at carrying value		304
Financial Liabilities Fair Value Disclosure	$ 405	$ 114