Benefit Plans - Contributions to Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Jul. 01, 2019
Qualified Plan (ERP)
Benefit Plans
Benefit accruals for the company's employees	$ 0
Pension Plan
Benefit Plans
Benefit accruals for the company's employees	(75,968)	$ (77,439)
Pension Plan | Qualified Plan (ERP)
Benefit Plans
Expected contributions in 2024	0
Pension Plan | Nonqualified Plan
Benefit Plans
Expected contributions in 2024	300
SERP and Directors' Plan
Benefit Plans
Benefit accruals for the company's employees			$ 0
Other Benefits | Nonqualified Plan
Benefit Plans
Expected contributions in 2024	$ 1,200