Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss) after noncontrolling interests	$ 79,034	$ (58,511)	$ 1,856
Net income attributable to noncontrolling interests	10,223	3,908	5,386
Net (loss) income	89,257	(54,603)	7,242
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Stock-based compensation expense	9,348	15,107	13,754
Net (accretion of discount) amortization of premiums on investments in fixed-maturity securities	(4,497)	(961)	169
Depreciation and amortization	8,184	8,010	5,549
Deferred income tax (benefit) expense	(1,102)	(9,881)	1,142
Net realized investment losses (gains)	1,996	1,187	(6,472)
Net unrealized investment (gains) losses	(3,215)	7,153	(1,363)
Credit loss expense - reinsurance recoverable	(336)	364	5
Net (income) loss from unconsolidated joint venture	0	(495)	(417)
Distributions received from unconsolidated joint venture	0	489	114
Net income from limited partnership investments	(661)	(3,963)	(4,947)
Distributions received from limited partnership interests	1,148	3,001	3,604
Impairment loss	0	2,284	0
Loss on extinguishment of debt	177	0	0
Debt conversion expense	0	0	1,754
Gain on involuntary conversion	0	(13,402)	0
Gain on sale of real estate investments	(8,811)	(376)	0
Gain from remeasurement of contingent liabilities	0	(3,117)	0
Foreign currency remeasurement loss	60	108	64
Other non-cash items	158	(47)	61
Changes in operating assets and liabilities:
Accrued interest and dividends receivable	(1,555)	(1,599)	235
Income taxes	10,509	1,277	470
Premiums receivable, net	(3,039)	33,159	225
Assumed premiums receivable	(19,954)	0	0
Prepaid reinsurance premiums	(19,605)	(40,272)	10,021
Reinsurance recoverable	338,401	(612,073)	8,491
Deferred policy acquisition costs	2,612	12,173	(13,837)
Funds withheld for assumed business	18,685	24,944	(73,716)
Other assets	(19,893)	(15,581)	4,487
Losses and loss adjustment expenses	(278,692)	626,600	24,996
Unearned premiums	133,110	1,303	97,345
Advance premiums	(2,692)	4,816	2,401
Reinsurance payable on paid losses and loss adjustment expenses	(5,461)	4,589	4,017
Ceded reinsurance premiums payable	(8,725)	(1,672)	9,554
Assumed reinsurance balances payable	850	0	(87)
Reinsurance recovered in advance on unpaid losses	(19,863)	19,863	0
Accrued expenses and other liabilities	14,264	(8,397)	1,642
Net cash (used in) provided by operating activities	230,658	(12)	96,503
Cash flows from investing activities:
Investments in limited partnership interests	(1,483)	(1,967)	(3,756)
Distributions received from limited partnership interests	3,115	5,360	4,657
Distributions received from unconsolidated joint venture	18	351	623
Purchase of property and equipment	(6,502)	(6,341)	(3,318)
Purchase of real estate investments	(21,405)	(841)	(1,367)
Purchase of intangible assets	(1,786)	(3,800)	0
Purchase of fixed-maturity securities	(332,152)	(614,843)	(18,303)
Purchase of equity securities	(20,501)	(22,887)	(102,801)
Purchase of short-term and other investments	(81)	(42)	(1,307)
Compensation received for property relinquished through eminent domain	0	14,500	0
Proceeds from sales of real estate investments	21,746	667	0
Proceeds from sales of fixed-maturity securities	22,326	11,716	23,055
Proceeds from calls, repayments and maturities of fixed-maturity securities	328,719	151,415	23,430
Proceeds from sales of equity securities	12,202	31,605	112,310
Proceeds from sales, redemptions and maturities of short-term and other investments	53	570	3,629
Net cash (used in) provided by investing activities	4,269	(434,537)	36,852
Cash flows from financing activities:
Cash dividends paid	(13,719)	(15,233)	(14,065)
Cash dividends received under share repurchase forward contract	0	76	306
Net (repayment) borrowing under revolving credit facility	0	(15,000)	(8,750)
Net proceeds from issuance of common stock	84,572	0	0
Proceeds from issuance of redeemable noncontrolling interest and warrants	0	0	100,000
Issuance costs - redeemable noncontrolling interest	0	0	(6,262)
Dividends paid	(6,763)	(5,508)	(2,542)
Proceeds from issuance of long-term debt	12,000	172,500	0
Repayment of long-term debt	(562)	(1,009)	(970)
Redemption of long-term debt	(6,895)	0	0
Repurchases of common stock	(784)	(71,242)	(1,314)
Repurchases of common stock under share repurchase plan	0	(17,070)	0
Purchase of noncontrolling interests	(354)	(406)	(55)
Debt conversion expense paid	0	0	(1,895)
Debt issuance costs	(378)	(6,041)	(152)
Net cash provided by (used in) financing activities	67,117	41,067	64,301
Effect of exchange rate changes on cash	(42)	(98)	(54)
Net increase (decrease) in cash and cash equivalents	302,002	(393,580)	197,602
Cash, cash equivalents and restricted cash at beginning of year	237,763	631,343	433,741
Cash, cash equivalents and restricted cash at end of year	539,765	237,763	631,343
Supplemental disclosure of cash flow information:
Cash paid for income taxes	19,045	146	2,379
Cash paid for interest	9,248	6,155	7,110
Non-cash investing and financing activities:
Unrealized loss on investments in available-for-sale securities, net of tax	6,961	(10,772)	(1,068)
Payable on purchases of equity securities	379	0	0
Receivable from maturities of fixed-maturity securities	91,085	0	0
Common stock issued on conversions of 4.25% senior notes	0	0	114,928
Warrants issued in Centerbridge transaction	0	0	9,217
Asset acquired under finance lease	0	0	6
Assumed liability	4	0	0
Acquisition of intangibles:
Common stock issued	0	0	5,410
Contingent consideration payable		1,069
Contingent consideration payable	$ 0	$ 1,069	$ 2,419