Benefit Plans - Components of Net Periodic Pension Income for Qualified and Non-Qualified Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Interest cost	$ 3,510	$ 4,941	$ 6,113
Expected return on plan assets	(16,364)	(17,200)	(16,453)
Amortization of net loss	1,538	1,003	264
Total net periodic pension income	$ (11,316)	$ (11,256)	$ (10,076)