Derivative Instruments and Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Trading Activity, Gains and Losses, Net [Line Items]
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ 55,714	$ (24,318)	$ (193,224)
Change in Fair Value	107,518	(8,808)	(248,399)
Gain (Loss) Reclassified to Earnings due to Settlements	(52,884)	(16,410)	55,175
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	1,080	900
Gain (Loss) on Derivative Instruments, Net, Pretax	51,804	15,510	(55,175)
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(4,650)	560	(1,006)
Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	88,326	(20,060)	(98,750)
Derivative, Net Hedge Ineffectiveness Gain (Loss)	274	45	(491)
Operating expenses
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	791	(3,379)	43,575
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(547)
Cost of products sold
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	(37,313)	38,949
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ (4,377)	$ 515	$ (515)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

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