Accumulated Other Comprehensive Loss - Amount Reclassified from AOCL (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit credit	$ (4,451)	$ (4,776)	$ (12,062)	$ (14,753)
Tax benefit	(17,422)	(5,012)	(44,276)	(2,936)
Net income	60,554	34,325	170,621	21,438
Reclassification out of Accumulated Other Comprehensive Income | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit credit	(20)	0	(60)	0
Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit credit	318	0	953	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	298	0	893	0
Tax benefit	(250)	0	(250)	0
Net income	$ 48	$ 0	$ 643	$ 0