Derivative Instruments And Hedging Activities Derivatives and Hedging Instruments Gains Losses due to Settlements Hedge Ineffectiveness (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Trading Activity, Gains and Losses, Net [Line Items]
Derivative Instruments, change in fair value	$ 8,501	$ 47,988	$ (5,647)	$ 140,466
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(14,802)	(13,197)	(19,494)	(18,957)
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	270	270	540	540
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	(6,031)	35,061	(24,601)	122,049
Derivative, Net Hedge Ineffectiveness Gain (Loss)	2,354	1,354	4,011	(806)
Derivative Instruments, Gain (Loss) Recognized in Income	14,532	12,927	18,954	18,417
Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(140)		(274)
Derivative Instruments, Gain (Loss) Recognized in Income	49,752	(48,942)	98,932	(74,273)
Cost of Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	2,494		3,738
Derivative Instruments, Gain (Loss) Recognized in Income	(30,964)	61,124	(71,733)	90,441
Operating Expense [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)		1,354	547	(806)
Derivative Instruments, Gain (Loss) Recognized in Income	$ (4,256)	$ 745	$ (8,245)	$ 2,249