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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plans | U.S.         
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Service cost $ 0 $ 192 $ 0 $ 384
Interest cost 551 675 1,102 1,351
Expected return on plan assets (1,094) (970) (2,187) (1,940)
Amortization of net loss 0 0 0 0
Net periodic (benefit) expense (543) (103) (1,085) (205)
Defined Benefit Pension Plans | Foreign        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Service cost 0 262 0 521
Interest cost 65 73 130 144
Expected return on plan assets (65) (70) (130) (138)
Amortization of net loss 0 23 0 46
Net periodic (benefit) expense 0 288 0 573
Other Postretirement Benefits Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost 4 5 8 10
Amortization of net loss 2 0 3 0
Amortization of prior service credit (58) (58) (116) (116)
Net periodic (benefit) expense $ (52) $ (53) $ (105) $ (106)