Pension and Other Postretirement Benefits (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined benefit pension plans [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 450,627	$ 302,019
Accumulated benefit obligation	437,999	289,170
Fair value of plan assets	370,616	223,526
Total accumulated benefit obligation	481,241	447,591
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	389,613	271,459
Accumulated benefit obligation	378,431	262,172
Fair value of plan assets	331,260	204,270
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	61,014	30,560
Accumulated benefit obligation	59,568	26,998
Fair value of plan assets	$ 39,356	$ 19,256