Accumulated Other Comprehensive Income (Loss) - Schedule of reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss)
Interest expense	$ (3,537)	$ (5,138)	$ (7,663)	$ (12,185)
Net loss resulting from early retirement of debt		9,629	1,126	13,749
Interest and investment income	4,201	528	7,537	552
Total before tax	90,273	408,059	325,519	680,386
Provision for income taxes	12,920	496	50,058	951
Net Income (Loss)	77,353	407,563	275,461	679,435
Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Provision for income taxes			1,272
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Provision for income taxes			8
Reclassification out of Accumulated Other Comprehensive Income | Derivative instruments
Accumulated Other Comprehensive Income (Loss)
Interest expense				(112)
Net loss resulting from early retirement of debt				(1,428)
Provision for income taxes	0	0	0	0
Net Income (Loss)				(1,540)
Reclassification out of Accumulated Other Comprehensive Income | Pension, postretirement and other post-employment benefits
Accumulated Other Comprehensive Income (Loss)
Amortization of actuarial gains (losses), net	2,859	346	5,717	973
Amortization of prior service credits	36	177	73	73
Pension settlement		414		414
Total before tax	2,895	937	5,790	1,460
Provision for income taxes	636	0	1,272	0
Net Income (Loss)	2,259	937	4,518	1,460
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss)
Interest and investment income	1		(21)	(182)
Provision for income taxes	(3)	$ 0	(8)	0
Net Income (Loss)	$ 4		$ (13)	$ (182)