Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retirement Benefits [Abstract]
Service cost	$ 3,641	$ 4,760	$ 11,166	$ 15,266
Interest cost	1,552	1,131	4,713	3,593
Expected return on plan assets	(1,276)	(1,339)	(3,865)	(4,260)
Recognized actuarial (gain) loss	(101)	13	(304)	39
Net periodic pension cost	$ 3,816	$ 4,565	$ 11,710	$ 14,638