Quarterly report pursuant to Section 13 or 15(d)

Net Periodic Pension Expense Benefit (Details)

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Net Periodic Pension Expense Benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Pension Plans | U.S.     
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost $ 192 $ 219
Interest cost 2,152 2,507
Expected return on plan assets (3,331) (2,757)
Amortization of net (gain) loss 0 0
Amortization of prior service cost (credit) 0 0
Net periodic expense (benefit) (987) (31)
Defined Benefit Pension Plans | Foreign    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost 997 806
Interest cost 707 833
Expected return on plan assets (810) (603)
Amortization of net (gain) loss 41 0
Amortization of prior service cost (credit) 6 0
Net periodic expense (benefit) 941 1,036
Supplemental Retirement Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Interest cost 86 121
Net periodic expense (benefit) 86 121
Other Postretirement Benefits Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)    
Service cost 0 3
Interest cost 24 38
Amortization of net (gain) loss (7) (8)
Amortization of prior service cost (credit) (58) (33)
Net periodic expense (benefit) $ (41) $ 0