Pension and Other Postretirement Benefits (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined benefit pension plans [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 459,526	$ 417,118
Accumulated benefit obligation	444,378	406,144
Fair value of plan assets	348,390	312,451
Total accumulated benefit obligation	480,027	430,136
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	396,695	354,287
Accumulated benefit obligation	382,023	343,596
Fair value of plan assets	294,040	256,518
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	62,831
Accumulated benefit obligation	62,355	62,548
Fair value of plan assets	$ 54,350	$ 55,933