Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 157,757	$ 181,131
Other comprehensive income (loss), net of tax (Note 15)
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected losses has not been recognized	65,854	(251,292)
Less: Reclassification adjustment for net gains (losses) on investments included in net income
Net realized gains (losses) on disposals and non-credit related impairment losses	(4,133)	(1,562)
Net unrealized gains (losses) on investments	69,987	(249,730)
Other adjustments to comprehensive income (loss), net	179	84
Other comprehensive income (loss), net of tax	70,166	(249,646)
Comprehensive income (loss)	$ 227,923	$ (68,515)