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Employee Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Retirement Benefits [Abstract]    
Net actuarial loss $ 625,339 $ 939,290
Prior service cost 7,958 8,648
Amounts recognized in accumulated other comprehensive loss $ 633,297 $ 947,938