Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (costs)/income	$ 1,023	$ (684)	$ 2,074	$ (1,369)
Total reclassification, before tax	(87,083)	(60,976)	(142,738)	(92,734)
Income tax expense	(21,543)	(14,402)	(36,781)	(23,839)
Total reclassification, net of tax	$ (65,540)	$ (46,574)	(105,957)	$ (68,895)
Amounts reclassified from accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax			6,603
Income tax expense			1,764
Total reclassification, net of tax			4,839
Amounts reclassified from accumulated other comprehensive loss | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (costs)/income			(972)
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (costs)/income			7,548
Amounts reclassified from accumulated other comprehensive loss | Pension settlement charge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (costs)/income			$ 27