Pension and Other Postretirement Benefits (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Defined benefit pension plans [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 417,118	$ 380,030
Accumulated benefit obligation	406,144	369,193
Fair value of plan assets	312,451	315,524
Total accumulated benefit obligation	430,136	403,612
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	354,287	321,775
Accumulated benefit obligation	343,596	312,039
Fair value of plan assets	256,518	269,896
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	62,831	58,255
Accumulated benefit obligation	62,548	57,154
Fair value of plan assets	$ 55,933	$ 45,628