CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 634,983	$ 446,093	$ 673,763
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	66,014	57,812	48,784
Deferred tax expense	5,188	27,475	11,096
Loss on debt extinguishment	36,914	26,736	0
Net realized investment (gains) losses	(6,582)	(13,752)	(5,306)
Change in certain assets and liabilities:
Accrued investment income	(1,905)	(292)	(1,704)
Reinsurance recoverable on loss reserves	28,137	(73,401)	11,687
Reinsurance recoverable on paid losses	(35,606)	852	1,427
Premiums receivable	(496)	(457)	(497)
Deferred insurance policy acquisition costs	(110)	(3,030)	(643)
Profit commission receivable	(19,245)	4,586	4,945
Loss reserves	2,985	325,203	(118,685)
Unearned premiums	(45,409)	(93,203)	(29,683)
Return premium accrual	7,200	(500)	(11,500)
Current income taxes	5,429	6,271	1,057
Other, net	18,820	21,916	24,791
Net cash provided by operating activities	696,317	732,309	609,532
Cash flows from investing activities:
Purchases of investments	(1,531,129)	(2,636,972)	(1,394,126)
Proceeds from sales of investments	473,904	836,851	229,796
Proceeds from maturity of fixed income securities	900,591	1,030,926	748,165
Net decrease in payables for securities	0	0	(307)
Additions to property and equipment	(4,115)	(3,311)	(5,636)
Net cash used in investing activities	(160,749)	(772,506)	(422,108)
Cash flows from financing activities:
Proceeds from issuance of senior notes	0	640,250	0
Purchase of senior notes	0	(179,735)	0
Payment of original issue discount - senior notes	0	(2,969)	0
Purchase of convertible junior subordinated debentures	(98,610)	(36,392)	0
Payment of original issue discount- convertible junior subordinated debentures	0	(15,049)	0
Cash portion of loss on debt extinguishment	(36,914)	(25,266)	0
Repurchase of common stock	(290,818)	(119,997)	(125,766)
Dividends paid	(94,219)	(82,061)	(41,914)
Payment of debt issuance costs	0	(2,020)	0
Payment of withholding taxes related to share-based compensation net share settlement	(6,729)	(8,940)	(5,726)
Net cash provided by (used in) financing activities	(527,290)	167,821	(173,406)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	8,278	127,624	14,018
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year	296,680	169,056	155,038
Cash and cash equivalents and restricted cash and cash equivalents at end of year	$ 304,958	$ 296,680	$ 169,056