Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans - Net Periodic Pension Expense Benefit (Details)

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Benefit Plans - Net Periodic Pension Expense Benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Pension Plans | U.S.    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost $ 219 $ 310
Interest cost 2,507 2,372
Expected return on plan assets (2,757) (3,174)
Amortization of net (gain) loss 0 0
Net periodic expense (benefit) (31) (492)
Defined Benefit Pension Plans | Foreign    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost 806 887
Interest cost 833 1,505
Expected return on plan assets (603) (1,319)
Amortization of net (gain) loss 0 13
Net periodic expense (benefit) 1,036 1,086
Supplemental Retirement Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Interest cost 121 110
Net periodic expense (benefit) 121 110
Other Postretirement Benefits Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost 3 6
Interest cost 38 38
Amortization of prior service credit (33) (19)
Amortization of net (gain) loss (8) (11)
Net periodic expense (benefit) $ 0 $ 14