Retirement Plans - Net Periodic Pension Expense for Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17,490	$ 18,129	$ 15,750
Interest cost	7,333	9,899	19,617
Expected return on assets	(28,577)	(26,304)	(32,645)
Amortization of prior service credit	(856)	(903)	(886)
Recognized net actuarial loss	5,875	5,806	10,303
Curtailments	15	0	0
(Gain) loss on settlements	198,132	(406)	137,898
Net periodic pension expense	199,412	6,221	150,037
Disc Ops
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 1,000	$ 2,000	$ 2,000