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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, 2020
Dec. 31, 2019
Projected Benefit Obligations:    
Beginning of measurement period $ 748,258 $ 694,482
Service cost 1,295 1,278
Interest cost 16,643 22,408
Employee contributions 35 45
Actuarial loss (gain) 49,938 77,549
Plan settlements (1,450)  
Benefits paid (55,150) (50,415)
Foreign currency effects 1,904 2,911
End of measurement period 761,473 748,258
Fair Value of Plans' Assets:    
Beginning of measurement period 714,017 649,688
Actual return on plans' assets 71,446 109,670
Defined benefit plan, voluntary contribution 10,446 1,112
Employee contributions 35 522
Plan settlements (1,450)  
Benefits paid (55,150) (50,415)
Foreign currency effects 1,847 3,440
End of measurement period 741,191 714,017
Unfunded Status $ (20,282) $ (34,241)