Pensions and Other Postretirement Benefits Level 4 (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			$ 1,900,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	340,000	294,000	1,027,000	921,000
Defined Benefit Plan, Interest Cost	438,000	341,000	1,324,000	1,069,000
Defined Benefit Plan, Expected Return on Plan Assets	(204,000)	(108,000)	(616,000)	(338,000)
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(21,000)	(22,000)	(65,000)	(66,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	39,000	40,000	119,000	120,000
Defined Benefit Plan, Amortization of Gains (Losses)	84,000	94,000	252,000	283,000
Defined Benefit Plan, Net Periodic Benefit Cost	$ 676,000	$ 639,000	$ 2,041,000	$ 1,989,000