Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) In Thousands, unless otherwise specified							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Pension And SERPA Benefits [Member]	Dec. 31, 2011 Pension And SERPA Benefits [Member]	Dec. 31, 2010 Pension And SERPA Benefits [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member] Limited Partnership Interests [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member] Limited Partnership Interests [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member] Other [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member] Pension And SERPA Benefits [Member] Other [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Balance, beginning of period	$ 109,160	$ 1,253,916	$ 1,539,018	$ 1,253,916	$ 1,105,487	$ 42,127	$ 42,127	$ 42,632	$ 40,016	$ 40,421	$ 2,111	$ 2,211
Relating to assets still held at the reporting date							(820)	(2,888)	(930)	(3,018)	110	130
Purchases, sales and settlements							4,725	(2,383)	3,132	(2,613)	1,593	230
Balance, end of period	$ 109,160	$ 1,253,916	$ 1,539,018	$ 1,253,916	$ 1,105,487	$ 42,127	$ 36,582	$ 42,127	$ 35,954	$ 40,016	$ 628	$ 2,111