Employee Benefit Plans - Changes in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in benefit obligation
Benefit obligation at beginning of year	$ 1,923,163	$ 2,532,973
Service cost	5,991	10,204	$ 12,218
Interest cost	104,490	75,248	71,693
Plan participants’ contributions	1,765	1,892
Actuarial loss (gain)	76,072	(546,266)
Foreign currency exchange rate changes	5,580	(15,744)
Gross benefits paid	(137,742)	(135,907)
Plan amendments	2,464	0
Settlements	0	(276)
Acquired plans	0	1,039
Benefit obligation at end of year	$ 1,981,783	$ 1,923,163	$ 2,532,973