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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9,730 $ 8,659 $ 5,947
Interest cost 9,415 10,484 8,506
Expected return on assets (18,019) (15,715) (10,118)
Amortization of prior service cost 41 41 48
Recognized actuarial loss 6,901 4,971 3,984
Net periodic benefit cost 8,068 8,440 8,367
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,115 900 581
Interest cost 806 956 775
Expected return on assets (970) (857) (475)
Amortization of prior service cost 0 97 197
Recognized actuarial loss 257 229 240
Net periodic benefit cost $ 1,208 $ 1,325 $ 1,318