Accumulated Other Comprehensive Income (Loss) - Schedule of reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss)
Interest expense	$ (4,316)	$ (4,126)
Net loss resulting from early retirement of debt		1,126
Interest and investment income	6,100	3,336
Total before tax	59,672	235,246
Provision for income taxes	3,719	37,138
Net Income (Loss)	55,953	198,108
Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Provision for income taxes	427
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Provision for income taxes	1
Reclassification out of Accumulated Other Comprehensive Income | Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Amortization of actuarial gains, net 1	2,006	2,858
Amortization of prior service credits		37
Provision for income taxes	427	636
Net Income (Loss)	1,579	2,259
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Interest and investment income	9	(22)
Provision for income taxes	1	(5)
Net Income (Loss)	$ 8	$ (17)