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Derivatives (Details)	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Cash flow hedges Foreign currency contracts (long) 2013 EUR USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Cash flow hedges Foreign currency contracts (long) 2013 EUR	Dec. 31, 2012 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Fair value hedges Commodity contract inventory (long) 2013 BBL USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Fair value hedges Commodity contract inventory (short) 2013 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (long) 2013 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (long) 2014 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (long) 2015 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (short) 2013 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (short) 2014 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Commodity contract (short) 2015 BBL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 AUD USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 AUD	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 BRL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 BRL	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CAD USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CAD	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CLP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 CLP	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 COP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 COP	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 EUR USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 EUR EUR (€)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 GBP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 GBP GBP (£)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 JPY USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 JPY JPY (¥)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 MXN USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 MXN	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 NOK USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2013 NOK	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2014 GBP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (long) 2014 GBP GBP (£)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 AUD USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 AUD	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 BRL USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 BRL	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CAD USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CAD	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CLP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 CLP	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 COP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 COP	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 DKK USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 DKK	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 EUR USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 EUR EUR (€)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 GBP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 GBP GBP (£)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 JPY USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 JPY JPY (¥)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 MXN USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 MXN	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 NOK USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 NOK	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 PLN USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 PLN	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 RON USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2013 RON	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2014 GBP USD ($)	Dec. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts (short) 2014 GBP GBP (£)
Derivatives
Unrealized net gain on cash flow hedges	$ 100,000
Unrealized net gain related to the ineffectiveness between the entity's derivative hedging instruments and hedged items	1,000,000	2,400,000
Unrealized net gain (loss) related to non-designated derivative positions	9,800,000	11,100,000
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts			1,758,000	1,758,000		310,000	2,227,000		37,205,000	445,000	26,000	29,588,000	542,000	26,000
Weighted Average Fixed Price of cash flow hedge commodity contracts			0.81
Weighted Average Mark-to-Market Amount of cash flow hedge commodity contracts			0.08
Fair value of cash flow hedge commodity contracts			148,000
Weighted Average Fixed Price of fair value hedge commodity contracts						122.75	121.97
Weighted Average Mark-to-Market Amount of fair value hedge commodity contracts						0.79	(0.69)
Fair value hedge commodity contracts						246,000	(1,539,000)
Weighted Average Fixed Price of non-designated commodity contracts									74.92	98.12	115.63	87.34	99.74	117.24
Weighted Average Mark-to-Market Amount of non-designated commodity contracts									0.68	2.52	0.69	(0.48)	(1.35)	(0.69)
Fair value of non-designated commodity contracts									25,276,000	1,123,000	18,000	(14,305,000)	(734,000)	(18,000)
Non-Designated, Notional amount of foreign currency contracts																3,080,000		1,859,000		16,795,000		1,553,106,000		18,734,591,000		1,175,000		47,725,000		3,538,000		381,114,000		9,400,000		250,000		11,111,000		1,366,000		12,220,000		892,962,000		15,265,622,000		5,053,000		18,434,000		79,935,000		15,768,000		247,549,000		7,123,000		4,459,000		6,873,000		3,090,000
Weighted Average Fixed Price of non-designated foreign currency contracts															1.04		2.11		0.99		479.38		1,803.89		0.75		0.63		80.71		12.97		5.58		0.62		1.04		2.10		0.99		483.07		1,803.26		5.69		0.76		0.63		77.72		12.96		5.64		3.17		3.48		0.63
Weighted Average Mark-to-Market Amount of non-designated foreign currency contracts															0.00		0.02		0.00		0.00		0.00		(0.01)		0.03		0.00		0.00		0.00		0.00		0.01		(0.01)		0.01		0.00		0.00		0.00		(0.01)		(0.03)		0.00		0.00		0.00		(0.01)		(0.01)		(0.03)
Mark-to-Market value of non-designated foreign currency contracts															2,000		32,000		(67,000)		(10,000)		147,000		(6,000)		1,417,000		(4,000)		(375,000)		(4,000)		1,000		81,000		(13,000)		69,000		12,000		(96,000)		(7,000)		(175,000)		(2,719,000)		21,000		307,000		(13,000)		(23,000)		(37,000)		(99,000)
Mark-to-Market, Total					$ (1,293,000)			$ 9,801,000

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Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

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