Pension Plans and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,309	$ 1,114	$ 3,928	$ 3,342
Interest cost	4,997	5,331	14,990	15,994
Expected return on plan assets	(7,188)	(7,951)	(21,566)	(23,853)
Amortization of prior service cost (credit)	192	171	577	513
Amortization of actuarial loss	3,839	2,479	11,517	7,437
Net periodic cost (benefit)	3,149	1,144	9,446	3,433
Other Postretirement Employee Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	71	112	213	335
Interest cost	620	871	1,859	2,614
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(2,336)	(2,134)	(7,111)	(6,402)
Amortization of actuarial loss	781	992	2,345	2,975
Net periodic cost (benefit)	$ (864)	$ (159)	$ (2,694)	$ (478)