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Retirement Plans (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Funded Status of Plan [Abstract]      
Fair value of defined benefit plan assets $ 204,570 $ 202,981  
U.S. Pension Plans      
Funded Status of Plan [Abstract]      
Projected benefit obligation (155,003) (155,693) $ (134,593)
Fair value of defined benefit plan assets 136,128 135,887 128,516
Funded status of defined benefit plan (18,875) (19,806)  
U.S. Retiree Healthcare Plan      
Funded Status of Plan [Abstract]      
Projected benefit obligation (12,963) (13,512) (11,020)
Fair value of defined benefit plan assets 8,001 7,526 6,616
Funded status of defined benefit plan (4,962) (5,986)  
Non-U.S. Pension Plans      
Funded Status of Plan [Abstract]      
Projected benefit obligation (75,677) (82,006) (69,116)
Fair value of defined benefit plan assets 60,441 59,568 $ 40,820
Funded status of defined benefit plan $ (15,236) $ (22,438)