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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Pension Plans | U.S.         
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Service cost $ 0 $ 192 $ 0 $ 577
Interest cost 551 675 1,652 2,026
Expected return on plan assets (1,093) (970) (3,280) (2,910)
Amortization of net loss 0 0 0 0
Settlement (gain) recognized 26 0 26 0
Net periodic (benefit) expense (568) (103) (1,654) (307)
Defined Benefit Pension Plans | Foreign        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Service cost 0 280 0 798
Interest cost 63 78 193 221
Expected return on plan assets (63) (74) (193) (212)
Amortization of net loss 0 24 0 70
Settlement (gain) recognized 0 0 0 0
Net periodic (benefit) expense 0 308 0 877
Other Postretirement Benefits Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost 4 5 13 14
Amortization of net loss 2 0 4 1
Amortization of prior service credit (58) (58) (174) (174)
Net periodic (benefit) expense $ (52) $ (53) $ (157) $ (159)