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Retirement Plans - Reconciliation of Projected Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Projected Benefit Obligations:    
Beginning of measurement period $ 485,573 $ 730,315
Service cost 1,423 1,219
Interest cost 23,915 12,903
Employee contributions 23 22
Actuarial gain (11,023) (160,945)
Plan settlements 0 (1,780)
Benefits paid (51,232) (44,566)
Foreign currency effects 9,617 (51,595)
End of measurement period 458,296 485,573
Fair Value of Plans' Assets:    
Beginning of measurement period 477,728 739,789
Actual return on plans' assets 2,712 (161,284)
Employer contributions 3,265 1,506
Employee contributions 23 22
Plan settlements 0 (1,659)
Benefits paid (51,232) (44,566)
Foreign currency effects 10,661 (56,080)
End of measurement period 443,157 477,728
Unfunded Status $ (15,139) $ (7,845)