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Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Retirement Benefits [Abstract]        
Service cost $ 3,697 $ 5,088 $ 7,525 $ 10,506
Interest cost 1,558 1,204 3,161 2,462
Expected return on plan assets (1,278) (1,428) (2,589) (2,921)
Recognized actuarial loss (105) 13 (203) 26
Net periodic pension cost $ 3,872 $ 4,877 $ 7,894 $ 10,073