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, 2021
Mar. 31, 2020
Defined Benefit Pension Plans | U.S.     
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Service cost $ 0 $ 192
Interest cost 551 675
Expected return on plan assets (1,094) (970)
Amortization of net loss 0 0
Net periodic (benefit) expense (543) (103)
Defined Benefit Pension Plans | Foreign    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Service cost 0 261
Interest cost 65 72
Expected return on plan assets (65) (69)
Amortization of net loss 0 23
Net periodic (benefit) expense 0 287
Other Postretirement Benefits Plans    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Interest cost 4 5
Amortization of net loss 1 0
Amortization of prior service credit (58) (58)
Net periodic (benefit) expense $ (53) $ (53)