Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 3	$ 117
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	1	46
Gain (Loss) on Sale of Securities, Net	2	71
Gain (Loss) on Sale of Derivatives	(27,290)	16,416
Amortization of unrealized loss attributable to discontinued cash flow hedges	939	1,274
Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense, Net	(1,353)	(1,498)
Gain (Loss) on Derivative Instruments, Net, Pretax	(28,643)	14,918
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	1,726
Gain (Loss) on Sale of Derivatives, Income Tax	(10,823)	6,143
Gain (Loss) on Sale of Securities, Net	(17,820)	8,775
Gain (Loss) on Sale of Derivative Instruments - Noncontrolling Interest	820	873
Gain (Loss) on Sale of Derivatives - After Tax and NC Interests	(17,000)	9,648
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, Net of Tax	(1,055)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(18,053)	9,719
Operating Expense [Member]
Amortization of unrealized loss attributable to discontinued cash flow hedges	(1,573)
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	(1,549)
Cost of Sales [Member]
Gain (Loss) on Sale of Derivatives	(6,532)	50,541
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	(84)
Revenues (decrease) [Member]
Gain (Loss) on Sale of Derivatives	(19,185)	(34,125)
General and Administrative Expense [Member]
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, before Tax	$ (93)