CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 70,403	$ 41,301
Other comprehensive (loss) income, net of tax
Unrealized gain (loss) on debt securities arising during the period	30,485	(142,401)
Change in retirement obligation	115	346
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	4	11
Other comprehensive income (loss)	30,604	(142,044)
Comprehensive income (loss)	$ 101,007	$ (100,743)