Pension Plans and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (1,246)	$ (1,337)	$ (2,659)	$ (2,619)
Interest cost	4,458	5,012	8,912	9,993
Expected return on plan assets	(6,522)	(7,205)	(13,046)	(14,378)
Amortization of prior service cost (credit)	(195)	(192)	(390)	(385)
Amortization of actuarial loss	5,021	3,975	9,965	7,678
Net periodic cost (benefit)	4,398	3,311	8,880	6,297
Other Postretirement Employee Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	(23)	(19)	(46)	(142)
Interest cost	447	488	905	1,239
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	2,427	2,496	4,854	4,775
Amortization of actuarial loss	790	582	1,605	1,564
Net periodic cost (benefit)	$ (1,167)	$ (1,407)	$ (2,298)	$ (1,830)