Employee Benefit Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension And SERPA Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 37,341	$ 42,889	$ 47,308
Interest cost	80,805	77,996	74,578
Expected return on plan assets	(106,612)	(97,376)	(86,225)
Prior service cost (credit)	2,981	4,383	5,553
Net loss	30,266	23,872	12,755
Net curtailment loss	236	15,508	29,390
Settlement loss	274	4,673	1,411
Net periodic benefit cost	45,291	71,945	84,770
Postretirement Healthcare Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	7,630	9,957	11,390
Interest cost	19,644	20,774	22,449
Expected return on plan assets	(9,386)	(9,781)	(11,175)
Prior service cost (credit)	(3,878)	(2,914)	(1,299)
Net loss	7,192	9,394	5,924
Net curtailment loss		11,643	7,014
Net periodic benefit cost	$ 21,202	$ 39,073	$ 34,303