CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 712,949	$ 865,349	$ 634,983
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	35,230	54,252	66,014
Deferred tax expense (benefit)	1,065	(4,367)	5,188
Equity compensation	31,607	24,771	17,109
Loss on debt extinguishment	0	40,199	36,914
Net (gains) losses on investments and other financial instruments	14,141	7,463	(5,861)
Change in certain assets and liabilities:
Accrued investment income	(3,596)	(3,276)	(1,905)
Reinsurance recoverable on loss reserves	(5,062)	38,665	28,137
Reinsurance recoverable on paid losses	8,185	18,194	(35,606)
Premiums receivable	(499)	(1,460)	(496)
Deferred insurance policy acquisition costs	4,471	2,609	(110)
Profit commission receivable	5,108	4,724	(19,245)
Loss reserves	(52,609)	(325,534)	2,985
Unearned premiums	(37,510)	(46,401)	(45,409)
Return premium accrual	(4,400)	(11,800)	7,200
Current income taxes	(4,143)	(8,549)	5,429
Other, net	8,025	(4,827)	990
Net cash provided by operating activities	712,962	650,012	696,317
Cash flows from investing activities:
Purchases of investments	(1,469,540)	(674,406)	(1,531,129)
Proceeds from sales of investments	376,598	399,661	473,904
Proceeds from maturity of fixed income securities	913,415	688,484	900,591
Proceeds from sale of property and equipment	2,336	0	0
Additions to property and equipment	(1,999)	(3,254)	(4,115)
Net cash (used in) provided by investing activities	(179,190)	410,485	(160,749)
Cash flows from financing activities:
Conversion / purchase of convertible junior subordinated debentures	(28,637)	(89,118)	(98,610)
Redemption of 5.75% senior notes	0	(242,296)	0
Repayment of FHLB advance	0	(155,000)	0
Cash portion of loss on debt extinguishment	0	(39,514)	(36,914)
Repurchase of common stock	(337,182)	(385,573)	(290,818)
Dividends paid	(122,965)	(110,947)	(94,219)
Payment of withholding taxes related to share-based compensation net share settlement	(7,257)	(10,094)	(6,729)
Net cash used in financing activities	(496,041)	(1,032,542)	(527,290)
Net increase in cash and cash equivalents and restricted cash and cash equivalents	37,731	27,955	8,278
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year	332,913	304,958	296,680
Cash and cash equivalents and restricted cash and cash equivalents at end of year	$ 370,644	$ 332,913	$ 304,958