Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities
Net income (loss)	$ 19,199	$ 151,182
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	18,915	17,179
Stock-based compensation expense	16,709	12,886
Undistributed gains of equity method investments	(14,572)	(13,478)
Distributions in excess of current year income of equity method investments	10,377	6,698
Net realized and unrealized (gains) losses	338	2,082
Loss (gain) on disposal of fixed assets	321	5
Changes in assets and liabilities:
Increase in reserve for loss and loss expense, net of reinsurance recoverable	537,851	168,221
Increase in unearned premiums, net of prepaid reinsurance	251,547	240,189
(Increase) decrease in net federal income taxes	(45,257)	1,006
Increase in premiums receivable	(266,586)	(200,807)
Increase in deferred policy acquisition costs	(51,655)	(45,189)
Increase in accrued investment income	(5,926)	(264)
Decrease in accrued salaries and benefits	(29,418)	(23,192)
Increase in other assets	(22,122)	(4,667)
Decrease in other liabilities	(39,385)	(18,205)
Net cash provided by (used in) operating activities	380,336	293,646
Investing Activities
Purchases of fixed income securities, available-for-sale	(1,027,136)	(1,562,206)
Purchases of commercial mortgage loans	(34,281)	(27,201)
Purchases of equity securities	(13,738)	(8,373)
Purchases of alternative investments and other investments	(34,000)	(21,161)
Purchases of short-term investments	(3,016,380)	(2,422,123)
Sales of fixed income securities, available-for-sale	451,386	959,248
Proceeds from commercial mortgage loans	3,376	968
Sales of short-term investments	2,908,653	2,543,683
Redemption and maturities of fixed income securities, held-to-maturity	3,204	7,481
Redemption and maturities of fixed income securities, available-for-sale	415,790	227,884
Sales of equity securities	12,252	51,763
Sales of other investments	0	892
Distributions from alternative investments and other investments	11,526	5,130
Purchases of property and equipment	(13,932)	(9,549)
Net cash provided by (used in) investing activities	(333,280)	(253,564)
Financing Activities
Dividends to preferred stockholders	(4,600)	(4,600)
Dividends to common stockholders	(41,573)	(35,385)
Acquisition of treasury stock	(6,728)	(7,512)
Net proceeds from stock purchase and compensation plans	4,747	4,695
Proceeds from borrowings	0	20,000
Repayments of borrowings	0	(20,000)
Repayments of finance lease obligations	(1,266)	(1,231)
Net cash provided by (used in) financing activities	(49,420)	(44,033)
Net increase (decrease) in cash and restricted cash	(2,364)	(3,951)
Cash and restricted cash, beginning of period	13,272	25,209
Cash and restricted cash, end of period	$ 10,908	$ 21,258