Reclassification From Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 149,804	[1]
Other comprehensive income (loss) before reclassifications	17,616	[1]
Amounts reclassified	(171,762)	[1],[2]
Net current-period other comprehensive income (loss)	(154,146)	[1]	(258,624)		324,453
Ending balance	(4,342)	[1]	149,804	[1]
Gains And Losses On Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	172,166	[1]
Other comprehensive income (loss) before reclassifications	21,619	[1]
Amounts reclassified	(184,515)	[1],[2]
Net current-period other comprehensive income (loss)	(162,896)	[1]
Ending balance	9,270	[1]
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(22,311)	[1]
Amounts reclassified	12,753	[1],[2]
Net current-period other comprehensive income (loss)	12,753	[1]
Ending balance	(9,558)	[1]
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(51)	[1]
Other comprehensive income (loss) before reclassifications	(4,003)	[1]
Net current-period other comprehensive income (loss)	(4,003)	[1]
Ending balance	$ (4,054)	[1]

[1] All amounts are net of tax.

[2] See separate table below for details about these reclassifications.