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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9,359 $ 9,730 $ 8,659
Interest cost 10,708 9,415 10,484
Expected return on assets (18,841) (18,019) (15,715)
Amortization of prior service cost 17 41 41
Recognized actuarial loss/(gain) 4,620 6,901 4,971
Recognition of significant event (1,595) 0 0
Net periodic benefit cost 4,268 8,068 8,440
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,032 1,115 900
Interest cost 883 806 956
Expected return on assets (1,047) (970) (857)
Amortization of prior service cost 0 0 97
Recognized actuarial loss/(gain) (115) 257 229
Recognition of significant event 0 0 0
Net periodic benefit cost $ 753 $ 1,208 $ 1,325