Derivative Financial Instruments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011 gal bbl MMBTU	Jun. 30, 2010	Jun. 30, 2011 gal bbl MMBTU	Jun. 30, 2010	Dec. 31, 2010
Derivative financial instruments
Notional quantity of crude oil contract (in bbl)	6,382,676		6,382,676
Notional quantity of natural gas contract (in MMBtu)	15,635,865		15,635,865
Refined products (gal)	151,776,610		151,776,610
Notional amount for embedded derivative in commodity contract (in Dth per day)	9,000		9,000
Derivative contracts not designated as hedging instruments
Fair value of derivative instruments - current assets	$ 2,835,000		$ 2,835,000		$ 4,345,000
Fair value of derivative instruments - long-term assets	3,349,000		3,349,000		417,000
Fair value of derivative instruments - current liabilities	(78,345,000)		(78,345,000)		(65,489,000)
Fair value of derivative liabilities - long-term liabilities	(81,121,000)		(81,121,000)		(66,290,000)
Total derivative assets	6,184,000		6,184,000		4,762,000
Total derivative liabilities	(159,466,000)		(159,466,000)		(131,779,000)
Total Revenue: derivative gain (loss)	40,590,000	46,902,000	(45,089,000)	39,666,000
Total derivative loss related to purchased product costs	254,000	8,392,000	(19,140,000)	(4,997,000)
Derivative gain (loss) related to facility expenses	(2,927,000)	(934,000)	84,000	(128,000)
Derivative gain related to interest expense				1,871,000
Total (loss) gain	37,917,000	54,363,000	(64,145,000)	36,471,000
Premium payments, net of amortization	2,300,000		2,300,000
Derivative instruments not designated as hedging instruments
Derivative contracts not designated as hedging instruments
Fair value of derivative instruments - current assets	2,835,000		2,835,000		4,345,000
Fair value of derivative instruments - long-term assets	3,349,000		3,349,000		417,000
Fair value of derivative instruments - current liabilities	(78,345,000)		(78,345,000)		(65,489,000)
Fair value of derivative liabilities - long-term liabilities	(81,121,000)		(81,121,000)		(66,290,000)
Total derivative assets	6,184,000		6,184,000		4,762,000
Total derivative liabilities	(159,466,000)		(159,466,000)		(131,779,000)
Derivative instruments not designated as hedging instruments | Derivative revenue
Derivative contracts not designated as hedging instruments
Realized gain (loss)	(12,186,000)	(5,690,000)	(26,577,000)	(18,819,000)
Unrealized gain (loss)	52,776,000	52,592,000	(18,512,000)	58,485,000
Total Revenue: derivative gain (loss)	40,590,000	46,902,000	(45,089,000)	39,666,000
Derivative instruments not designated as hedging instruments | Derivative related to purchased product costs
Derivative contracts not designated as hedging instruments
Realized gain (loss)	(5,560,000)	(5,733,000)	(13,447,000)	(11,171,000)
Unrealized gain (loss)	5,814,000	14,125,000	(5,693,000)	6,174,000
Total derivative loss related to purchased product costs	254,000	8,392,000	(19,140,000)	(4,997,000)
Derivative instruments not designated as hedging instruments | Derivative related to facility expenses
Derivative contracts not designated as hedging instruments
Unrealized gain (loss)	(2,927,000)	(934,000)	84,000	(128,000)
Derivative instruments not designated as hedging instruments | Derivative related to interest expense
Derivative contracts not designated as hedging instruments
Realized gain (loss)				2,380,000
Unrealized gain (loss)				(509,000)
Derivative gain related to interest expense				1,871,000
Derivative instruments not designated as hedging instruments | Miscellaneous income, net
Derivative contracts not designated as hedging instruments
Unrealized gain (loss)		3,000		59,000
Derivative revenue | Commodity contracts (net)
Derivative contracts not designated as hedging instruments
Amortization of premium payments	1,100,000	500,000	2,100,000	1,100,000
Embedded derivative in natural gas processing and purchase contract.
Derivative financial instruments
Estimated fair value of embedded derivative contract liability including portion allocable to host processing agreement	104,074,000		104,074,000
Inception value for period from April 1, 2015 to December 31, 2022	53,507,000		53,507,000
Recorded value of embedded derivative contract liability	50,567,000		50,567,000
Embedded derivative in electricity purchase contract
Derivative financial instruments
Estimated fair value of embedded derivative contract asset	$ 1,100,000		$ 1,100,000