Derivative Instruments And Hedging Activities (Summary Of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments) (Details) - USD ($) $ in Thousands	Feb. 01, 2017	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Purchase Price Canadian Dollars	$ 1,125,000
Derivative Asset Fair Value Net Asset		$ 1,358	$ 9,484
Derivative Liability Fair Value Net Liability		17,966	32,580
Accrued Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability		17,182	32,580
Prepayments And Other [Member]
Derivative [Line Items]
Derivative Asset Fair Value Net Asset		1,358	9,484
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability Fair Value Net Liability		784
Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Derivative Asset Fair Value Gross Liability		0
Derivative Asset Fair Value Net Asset		0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		0	91
Derivative Asset Fair Value Gross Liability		0	0
Derivative Asset Fair Value Net Asset		0	91
Derivative Liability Fair Value Gross Liability		7,081	16,163
Derivative Liability Fair Value Gross Asset		0	(431)
Derivative Liability Fair Value Net Liability		7,081	15,732
Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Asset Fair Value Gross Liability		0	0
Derivative Asset Fair Value Net Asset		0	0
Derivative Liability Fair Value Gross Liability		6,374	13,185
Derivative Liability Fair Value Gross Asset		0	(431)
Derivative Liability Fair Value Net Liability		6,374	12,754
Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Liability Fair Value Gross Liability		707	2,978
Derivative Liability Fair Value Gross Asset		0	0
Derivative Liability Fair Value Net Liability		707	2,978
Designated as Hedging Instrument [Member] \| HEP Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset			91
Derivative Asset Fair Value Gross Liability			0
Derivative Asset Fair Value Net Asset			91
Derivative Liability Fair Value Gross Liability			0
Derivative Liability Fair Value Gross Asset			0
Derivative Liability Fair Value Net Liability			0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,358	10,149
Derivative Asset Fair Value Gross Liability		0	(756)
Derivative Asset Fair Value Net Asset		1,358	9,393
Derivative Liability Fair Value Gross Liability		15,302	26,735
Derivative Liability Fair Value Gross Asset		(4,417)	(9,887)
Derivative Liability Fair Value Net Liability		10,885	16,848
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		0	4,244
Derivative Asset Fair Value Gross Liability		0	(756)
Derivative Asset Fair Value Net Asset		0	3,488
Derivative Liability Fair Value Gross Liability		8,517	12,903
Derivative Liability Fair Value Gross Asset		(4,417)	(9,887)
Derivative Liability Fair Value Net Liability		4,100	3,016
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,358	5,905
Derivative Asset Fair Value Gross Liability		0
Derivative Asset Fair Value Net Asset		1,358	5,905
Derivative Liability Fair Value Gross Liability		904	5,338
Derivative Liability Fair Value Net Liability		904	5,338
Not Designated as Hedging Instrument [Member] \| Nymex Futures Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		0	0
Derivative Asset Fair Value Gross Liability		0
Derivative Asset Fair Value Net Asset		0	0
Derivative Liability Fair Value Gross Liability		5,881	1,975
Derivative Liability Fair Value Net Liability		$ 5,881	1,975
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Future [Member]
Derivative [Line Items]
Derivative Liability Fair Value Gross Liability			6,519
Derivative Liability Fair Value Net Liability			$ 6,519

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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