Pension and Other Postretirement Benefits (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined benefit pension plans [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 302,019	$ 320,563
Accumulated benefit obligation	289,170	306,663
Fair value of plan assets	223,526	246,857
Total accumulated benefit obligation	447,591	497,453
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	271,459	297,067
Accumulated benefit obligation	262,172	286,217
Fair value of plan assets	204,270	234,305
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	30,560	23,496
Accumulated benefit obligation	26,998	20,446
Fair value of plan assets	$ 19,256	$ 12,552