CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 461,049	$ 294,663
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,820	40,660
Deferred tax expense	4,591	28,427
Loss on debt extinguishment	0	26,736
Net realized investment (gains) losses	(5,397)	(10,851)
Change in certain assets and liabilities:
Accrued investment income	(3,598)	1,923
Reinsurance recoverable on loss reserves	(11,987)	(61,502)
Reinsurance recoverable on paid losses	143	459
Premium receivable	(344)	1,616
Deferred insurance policy acquisition costs	(723)	(2,707)
Profit commission receivable	(18,564)	13,909
Loss reserves	52,372	285,115
Unearned premiums	(30,582)	(65,231)
Return premium accrual	7,200	(300)
Current income taxes	5,453	(40,855)
Other, net	2,977	(3,209)
Net cash provided by operating activities	512,410	508,853
Cash flows from investing activities:
Purchases of investments	(1,335,569)	(1,994,286)
Proceeds from sales of investments	239,483	741,732
Proceeds from maturity of fixed income securities	700,301	776,709
Additions to property and equipment	(2,388)	(2,214)
Net cash provided by (used in) investing activities	(398,173)	(478,059)
Cash flows from financing activities:
Proceeds from issuance of senior notes	0	640,250
Purchase of senior notes	0	(179,735)
Payment of original issue discount - senior notes	0	(2,969)
Purchase of convertible junior subordinated debentures	0	(36,392)
Payment of original issue discount - convertible junior subordinated debentures	0	(15,049)
Cash portion of loss on debt extinguishment	0	(25,266)
Payment of debt issuance costs	0	(1,197)
Repurchase of common stock	(150,000)	(119,997)
Dividends paid	(68,276)	(61,745)
Payment of withholding taxes related to share-based compensation net share settlement	(6,729)	(8,940)
Net cash provided by (used in) financing activities	(225,005)	188,960
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	(110,768)	219,754
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	296,680	169,056
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 185,912	$ 388,810