Pensions and Other Postretirement Benefits Level 4 (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 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	352,000	304,000	687,000	627,000
Defined Benefit Plan, Interest Cost	454,000	352,000	886,000	728,000
Defined Benefit Plan, Expected Return on Plan Assets	(211,000)	(111,000)	(412,000)	(230,000)
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(22,000)	(22,000)	(44,000)	(44,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	40,000	40,000	80,000	80,000
Defined Benefit Plan, Amortization of Gains (Losses)	84,000	95,000	168,000	189,000
Defined Benefit Plan, Net Periodic Benefit Cost	$ 697,000	$ 658,000	$ 1,365,000	$ 1,350,000