Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net income (loss)	$ 111,477	$ 240,390
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	27,228	23,432
Stock-based compensation expense	19,797	16,374
Undistributed gains of equity method investments	(18,573)	(16,266)
Distributions in excess of current year income of equity method investments	15,395	8,656
Net realized and unrealized (gains) losses	(5,051)	8,962
Loss (gain) on disposal of fixed assets	321	(6)
Changes in assets and liabilities:
Increase in reserve for loss and loss expense, net of reinsurance recoverable	714,659	254,018
Increase in unearned premiums, net of prepaid reinsurance	296,959	316,597
(Increase) decrease in net federal income taxes	(22,597)	216
Increase in premiums receivable	(218,861)	(244,361)
Increase in deferred policy acquisition costs	(63,657)	(57,130)
Increase in accrued investment income	(7,427)	(3,038)
Decrease in accrued salaries and benefits	(8,528)	(946)
Increase in other assets	(33,138)	(12,496)
Decrease in other liabilities	(40,301)	(12,096)
Net cash provided by (used in) operating activities	767,703	522,306
Investing Activities
Purchases of fixed income securities, held-to-maturity	(2,700)	0
Purchases of fixed income securities, available-for-sale	(1,767,201)	(1,999,665)
Purchases of commercial mortgage loans	(46,122)	(38,281)
Purchases of equity securities	(25,603)	(13,731)
Purchases of alternative investments and other investments	(66,372)	(83,810)
Purchases of short-term investments	(6,829,793)	(3,483,923)
Sales of fixed income securities, available-for-sale	743,539	1,115,260
Proceeds from commercial mortgage loans	11,112	1,473
Sales of short-term investments	6,578,742	3,609,991
Redemption and maturities of fixed income securities, held-to-maturity	3,441	7,918
Redemption and maturities of fixed income securities, available-for-sale	707,322	367,495
Sales of equity securities	12,252	53,344
Sales of other investments	(4)
Sales of other investments		900
Distributions from alternative investments and other investments	17,423	7,765
Purchases of property and equipment	(23,337)	(14,763)
Net cash provided by (used in) investing activities	(687,301)	(470,027)
Financing Activities
Dividends to preferred stockholders	(6,900)	(6,900)
Dividends to common stockholders	(62,358)	(53,122)
Acquisition of treasury stock	(15,539)	(7,804)
Net proceeds from stock purchase and compensation plans	5,724	5,616
Proceeds from borrowings	0	20,000
Repayments of borrowings	0	(20,000)
Repayments of finance lease obligations	(1,937)	(1,933)
Net cash provided by (used in) financing activities	(81,010)	(64,143)
Net increase (decrease) in cash and restricted cash	(608)	(11,864)
Cash and restricted cash, beginning of period	13,272	25,209
Cash and restricted cash, end of period	$ 12,664	$ 13,345