Employee Benefit Plans - Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in plan assets
Fair value of plan assets at beginning of year	$ 2,129,058	$ 2,756,803
Actual return on plan assets	217,767	(493,359)
Foreign currency exchange rate changes	5,407	(15,599)
Employer contributions	16,824	15,504
Plan participants’ contributions	1,765	1,892
Benefits paid	(137,742)	(135,907)
Settlements	0	(276)
Fair value of plan assets at end of year	$ 2,233,079	$ 2,129,058