Retirement And Other Postretirement Benefit Plans (Net Periodic Benefit Cost) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 899	$ 40	$ 2,709
Interest cost	1,731	1,741	5,015	5,258
Expected return on plan assets	(1,996)	(1,875)	(5,651)	(5,621)
Amortization, unrecognized net transition asset	(24)	(23)	(69)	(70)
Amortization, unrecognized prior service cost (credit)	2	(287)	5	(880)
Amortization, unrecognized loss	286	843	844	2,284
Net periodic pension benefit cost	$ 18	$ 1,298	$ 184	$ 3,680