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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Pension Plans | United States      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost $ 978 $ 1,019 $ 1,219
Interest cost 10,281 9,599 10,115
Expected return on plan assets (11,508) (12,851) (12,277)
Amortization of prior service cost 0 0 0
Amortization of net (gain) loss 0 0 0
Curtailment gain recognized 0 (576) 0
Settlement (gain) loss recognized 49 0 (48)
Net periodic expense (benefit) (200) (2,809) (991)
Defined Benefit Pension Plans | Foreign      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 3,382 3,566 3,686
Interest cost 3,290 3,340 3,271
Expected return on plan assets (3,153) (3,311) (3,208)
Amortization of prior service cost 24 0 0
Amortization of net (gain) loss (5) 49 (9)
Curtailment gain recognized 0 (340) 0
Settlement (gain) loss recognized 20 (11) 0
Net periodic expense (benefit) 3,558 3,293 3,740
Supplemental Retirement Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Interest cost 465 450 489
Amortization of net (gain) loss (10) 0 0
Net periodic expense (benefit) 455 450 489
Other Postretirement Benefits Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Service cost 10 16 21
Interest cost 152 150 174
Amortization of prior service cost (157) (112) (78)
Amortization of net (gain) loss (33) (26) (45)
Net periodic expense (benefit) $ (28) $ 28 $ 72