Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Net Periodic Benefit Cost (Details)

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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Pension Plans | United States      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost $ 0 $ 769 $ 978
Interest cost 2,210 2,665 3,099
Expected return on plan assets (4,360) (3,898) (3,444)
Amortization of net (gain) loss 0 0 0
Settlement (gain) loss recognized (26) 78 49
Net periodic expense (benefit) (2,176) (386) 682
Defined Benefit Pension Plans | Foreign      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 0 1,080 977
Interest cost 255 299 355
Expected return on plan assets (255) (287) (275)
Amortization of net (gain) loss 0 95 0
Settlement (gain) loss recognized 2,084 0 0
Net periodic expense (benefit) 2,084 1,187 1,057
Other Postretirement Benefits Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 0 0 10
Interest cost 17 19 29
Amortization of prior service credit (232) (232) (157)
Amortization of net (gain) loss 5 1 (11)
Net periodic expense (benefit) $ (210) $ (212) $ (129)