Benefit Plans - Accumulated Other Comprehensive loss (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Amounts within accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit cost
Net actuarial loss (gain)	$ 14,599	$ 15,812
Total, pretax effect	14,599	15,812
Tax impact	(3,894)	(4,218)
Ending balance in accumulated other comprehensive loss	10,705	11,594
Other Benefits
Amounts within accumulated other comprehensive loss that had not yet been recognized as components of net periodic benefit cost
Net actuarial loss (gain)	(7,271)	(8,405)	$ (3,094)
Total, pretax effect	(7,271)	(8,405)
Tax impact	1,939	2,242
Ending balance in accumulated other comprehensive loss	$ (5,332)	$ (6,163)