Fair Value Measurements (Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Financial Instruments Assets		$ 444,707
Financial Instruments Liabilities		43,655
Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	$ 3,840
Financial Instruments Liabilities	15,735
Level 1
Debt Instrument [Line Items]
Financial Instruments Liabilities	3,360
Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	3,840	444,502
Financial Instruments Liabilities	12,375	38,921
Level 3
Debt Instrument [Line Items]
Financial Instruments Assets		205
Financial Instruments Liabilities		2,759
Marketable securities [Member]
Debt Instrument [Line Items]
Financial Instruments Assets		424,148
Marketable securities [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets		424,148
Commodity Contract [Member]
Debt Instrument [Line Items]
Financial Instruments Assets		14,563
Financial Instruments Liabilities		26,845
Commodity Contract [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Liabilities	2,424
Commodity Contract [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets		14,358
Financial Instruments Liabilities	2,424	24,086
Commodity Contract [Member] | Level 3
Debt Instrument [Line Items]
Financial Instruments Assets		205
Financial Instruments Liabilities		2,759
Currency Swap [Member]
Debt Instrument [Line Items]
Financial Instruments Liabilities		6,519
Forward Contracts [Member]
Debt Instrument [Line Items]
Financial Instruments Assets		5,905
Financial Instruments Liabilities		8,316
Forward Contracts [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Assets	3,840
Financial Instruments Liabilities	1,020	8,316
Forward Contracts [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Assets	3,840	5,905
Financial Instruments Liabilities	1,020
Interest rate swap | HEP
Debt Instrument [Line Items]
Financial Instruments Assets		91
Interest rate swap | Level 2 | HEP
Debt Instrument [Line Items]
Financial Instruments Assets		91
Foreign Currency Gain (Loss) [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Liabilities		6,519
NYMEX futures contracts
Debt Instrument [Line Items]
Financial Instruments Liabilities	3,360	1,975
NYMEX futures contracts | Level 1
Debt Instrument [Line Items]
Financial Instruments Liabilities	3,360	1,975
NYMEX futures contracts | Level 2
Debt Instrument [Line Items]
Financial Instruments Liabilities	0	$ 0
Foreign Exchange Forward [Member] | Carrying Value [Member]
Debt Instrument [Line Items]
Financial Instruments Liabilities	8,931
Foreign Exchange Forward [Member] | Level 2
Debt Instrument [Line Items]
Financial Instruments Liabilities	$ 8,931