Postretirement Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Pension Benefits [Member]
Net loss (gain)	$ 111,964		$ 97,382
Prior service cost	6,446		8,526
Transition obligation	0		(5)
Net amounts recognized at year end	118,410		105,903		93,674	121,704
Other Benefits [Member]
Net loss (gain)	1,453	[1]	0	[1]
Net amounts recognized at year end	$ 1,453		$ 0

[1] The net loss for benefit plans other than pensions reduces other comprehensive income.