Pensions And Other Postretirement Benefits (Components Of Net Periodic Benefit (Credit) Cost) (Details) (USD $)	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2011 Pension Benefits [Member]	Sep. 30, 2010 Pension Benefits [Member]	Sep. 30, 2011 Pension Benefits [Member]	Sep. 30, 2010 Pension Benefits [Member]	Sep. 30, 2011 Other Benefits [Member]	Sep. 30, 2010 Other Benefits [Member]	Sep. 30, 2011 Other Benefits [Member]	Sep. 30, 2010 Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 2,162,000	$ 1,938,000	$ 6,491,000	$ 5,811,000	$ 218,000	$ 191,000	$ 654,000	$ 572,000
Interest cost			4,876,000	4,682,000	14,627,000	14,048,000	436,000	432,000	1,306,000	1,297,000
Expected return on plan assets			(8,507,000)	(8,643,000)	(25,575,000)	(25,931,000)
Amortization of transition amounts			1,000	1,000	3,000	3,000
Amortization of prior service cost			26,000	25,000	78,000	77,000	(114,000)	(138,000)	(341,000)	(416,000)
Recognized net actuarial losses			108,000	160,000	594,000	433,000	213,000	210,000	639,000	630,000
Settlement loss						285,000
Termination benefits						1,372,000
Net periodic benefit (credit) cost			(1,334,000)	(1,837,000)	(3,782,000)	(3,902,000)	753,000	695,000	2,258,000	2,083,000
Pension plans contributions	$ 3,500,000	$ 4,600,000