Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Net Periodic Benefit Cost (Details)

v3.20.4
Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Pension Plans | United States      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost $ 769 $ 978 $ 1,019
Interest cost 8,595 10,281 9,599
Expected return on plan assets (12,547) (11,508) (12,851)
Amortization of prior service cost 0 0 0
Amortization of net (gain) loss 0 0 0
Curtailment gain recognized 0 0 (576)
Settlement (gain) loss recognized 78 49 0
Net periodic expense (benefit) (3,105) (200) (2,809)
Defined Benefit Pension Plans | Foreign      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 3,895 3,210 3,104
Interest cost 2,193 2,627 2,637
Expected return on plan assets (2,270) (2,427) (2,490)
Amortization of prior service cost 0 24 0
Amortization of net (gain) loss 148 (29) 49
Curtailment gain recognized 0 0 0
Settlement (gain) loss recognized (14) (1) 0
Net periodic expense (benefit) 3,952 3,404 3,300
Supplemental Retirement Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Interest cost 352 465 450
Amortization of net (gain) loss 0 (10) 0
Net periodic expense (benefit) 352 455 450
Other Postretirement Benefits Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 0 10 16
Interest cost 99 152 150
Amortization of prior service cost (232) (157) (112)
Amortization of net (gain) loss (29) (33) (26)
Net periodic expense (benefit) $ (162) $ (28) $ 28