Financial Instruments (Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	$ 444,707	$ 184,889
Financial Instruments Liabilities	43,655	99,044
Level 1
Debt Instrument [Line Items]
Financial Instruments Assets	0	3,469
Financial Instruments Liabilities	1,975
Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	444,502	181,420
Financial Instruments Liabilities	38,921	99,044
Level 3
Debt Instrument [Line Items]
Financial Instruments Assets	205
Financial Instruments Liabilities	2,759
Marketable securities [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	424,148	144,019
Marketable securities [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	424,148	144,019
Commodity Contract [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	14,563	37,097
Financial Instruments Liabilities	26,845	98,930
Commodity Contract [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	14,358	37,097
Financial Instruments Liabilities	24,086	98,930
Commodity Contract [Member] | Level 3
Debt Instrument [Line Items]
Financial Instruments Assets	205
Financial Instruments Liabilities	2,759
Forward Contracts [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	5,905
Financial Instruments Liabilities	8,316
Forward Contracts [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	5,905
Financial Instruments Liabilities	8,316
Interest rate swap | Carrying Value [Member] | HEP
Debt Instrument [Line Items]
Financial Instruments Assets	91	304
Financial Instruments Liabilities		114
Interest rate swap | Level 2 | HEP
Debt Instrument [Line Items]
Financial Instruments Assets	91	304
Financial Instruments Liabilities		114
NYMEX futures contracts
Debt Instrument [Line Items]
Financial Instruments Liabilities	1,975
NYMEX futures contracts | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets		3,469
NYMEX futures contracts | Level 1
Debt Instrument [Line Items]
Financial Instruments Assets		3,469
Financial Instruments Liabilities	1,975
NYMEX futures contracts | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets		$ 0
Financial Instruments Liabilities	0
Foreign Exchange Forward [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Liabilities	6,519
Foreign Exchange Forward [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Liabilities	$ 6,519