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Retirement Plans (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amounts Recognized in Balance Sheet [Abstract]    
Long-term defined benefit plan liabilities $ (77,063) $ (85,230)
U.S. Pension Plans    
Amounts Recognized in Balance Sheet [Abstract]    
Current defined benefit plan liabilities (1,324) (193)
Long-term defined benefit plan liabilities (17,551) (19,613)
Net amount of defined benefit plan recognized in balance sheet (18,875) (19,806)
U.S. Retiree Healthcare Plan    
Amounts Recognized in Balance Sheet [Abstract]    
Current defined benefit plan liabilities (447) (351)
Long-term defined benefit plan liabilities (4,515) (5,635)
Net amount of defined benefit plan recognized in balance sheet (4,962) (5,986)
Non-U.S. Pension Plans    
Amounts Recognized in Balance Sheet [Abstract]    
Long-term defined benefit plan assets 1,402 838
Long-term defined benefit plan liabilities (16,638) (23,276)
Net amount of defined benefit plan recognized in balance sheet $ (15,236) $ (22,438)