Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Projected Benefit Obligation (Details)

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Benefit Plans - Projected Benefit Obligation (Details) - Defined Benefit Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States      
Defined Benefit Plan Disclosure      
Projected benefit obligation $ 288,482 $ 267,392 $ 246,311
Defined Benefit Plan, Funded (Unfunded) Status of Plan      
Projected benefit obligation 288,482 267,392  
Plan assets 263,837 231,413  
Foreign      
Defined Benefit Plan Disclosure      
Projected benefit obligation 114,889 101,192 $ 84,435
Defined Benefit Plan, Funded (Unfunded) Status of Plan      
Projected benefit obligation 92,679 101,192  
Plan assets $ 76,658 $ 85,308