Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net income (loss)	$ 515,837	$ 528,584	$ (298,665)
Other comprehensive income (loss):
Unrealized losses on investments	(7,524)	(957)	(50)
Amortization of actuarial loss	(499)	55	23
Adjustment to projected benefit obligations, net of tax	0	1,081	(650)
Other comprehensive income (loss)	(8,023)	179	(677)
Comprehensive income (loss)	$ 507,814	$ 528,763	$ (299,342)