Accumulated Other Comprehensive Income (Loss) - Schedule of reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss)
Interest expense	$ (3,912)	$ (3,120)	$ (12,161)	$ (10,783)
Net loss resulting from early retirement of debt				1,126
Interest and investment income	5,665	4,803	17,168	12,340
Total before tax	(12,829)	90,472	63,678	415,991
(Benefit from) provision for income taxes	(6,608)	16,781	(887)	66,839
Net Income (Loss)	(6,221)	73,691	64,565	349,152
Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
(Benefit from) provision for income taxes			1,281
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
(Benefit from) provision for income taxes			(43)
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	2,792	6,018	8,509
Amortization of prior service credits		25		98
Pension Termination		6,953		6,953
Total before tax	2,006	9,770	6,018	15,560
(Benefit from) provision for income taxes	427	2,147	1,281	3,419
Net Income (Loss)	1,579	7,623	4,737	12,141
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Interest and investment income	1	(40)	9	(61)
(Benefit from) provision for income taxes	0	(12)	2	(4)
Net Income (Loss)	$ 1	$ (28)	$ 7	$ (57)