CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 865,349	$ 634,983	$ 446,093
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	54,252	66,014	57,812
Deferred tax expense (benefit)	(4,367)	5,188	27,475
Equity compensation	24,771	17,109	13,803
Loss on debt extinguishment	40,199	36,914	26,736
Net (gains) losses on investments and other financial instruments	7,463	(5,861)	(12,576)
Change in certain assets and liabilities:
Accrued investment income	(3,276)	(1,905)	(292)
Reinsurance recoverable on loss reserves	38,665	28,137	(73,401)
Reinsurance recoverable on paid losses	18,194	(35,606)	852
Premiums receivable	(1,460)	(496)	(457)
Deferred insurance policy acquisition costs	2,609	(110)	(3,030)
Profit commission receivable	4,724	(19,245)	4,586
Loss reserves	(325,534)	2,985	325,203
Unearned premiums	(46,401)	(45,409)	(93,203)
Return premium accrual	(11,800)	7,200	(500)
Current income taxes	(8,549)	5,429	6,271
Other, net	(4,827)	990	6,937
Net cash provided by operating activities	650,012	696,317	732,309
Cash flows from investing activities:
Purchases of investments	(674,406)	(1,531,129)	(2,636,972)
Proceeds from sales of investments	399,661	473,904	836,851
Proceeds from maturity of fixed income securities	688,484	900,591	1,030,926
Additions to property and equipment	(3,254)	(4,115)	(3,311)
Net cash provided by (used in) investing activities	410,485	(160,749)	(772,506)
Cash flows from financing activities:
Proceeds from issuance of senior notes	0	0	640,250
Purchase of senior notes	0	0	179,735
Payment of original issue discount - senior notes	0	0	(2,969)
Purchase of convertible junior subordinated debentures	(89,118)	(98,610)	(36,392)
Payment of original issue discount- convertible junior subordinated debentures	0	0	(15,049)
Redemption of 5.75% senior notes	(242,296)	0	0
Repayment of FHLB advance	(155,000)	0	0
Cash portion of loss on debt extinguishment	(39,514)	(36,914)	(25,266)
Repurchase of common stock	(385,573)	(290,818)	(119,997)
Dividends paid	(110,947)	(94,219)	(82,061)
Payment of debt issuance costs	0	0	(2,020)
Payment of withholding taxes related to share-based compensation net share settlement	(10,094)	(6,729)	(8,940)
Net cash (used in) provided by financing activities	(1,032,542)	(527,290)	167,821
Net increase in cash and cash equivalents and restricted cash and cash equivalents	27,955	8,278	127,624
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year	304,958	296,680	169,056
Cash and cash equivalents and restricted cash and cash equivalents at end of year	$ 332,913	$ 304,958	$ 296,680