Employee Benefit Plans - Components of Net Periodic Benefit Income for the Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Service cost	$ 2,616	$ 3,041
Interest cost	18,867	17,906
Expected return on plan assets	(37,672)	(38,732)
Amortization of prior service cost	172	172
Amortization of actuarial loss	9,279	12,456
Net periodic benefit income	$ (6,738)	$ (5,157)