Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net (loss) income after noncontrolling interests	$ (58,511)	$ 1,856	$ 27,580
Net income attributable to noncontrolling interests	3,908	5,386	0
Net (loss) income	(54,603)	7,242	27,580
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Stock-based compensation expense	15,107	13,754	8,133
Net (accretion of discount) amortization of premiums on investments in fixed-maturity securities	(961)	169	(100)
Depreciation and amortization	8,010	5,549	8,747
Deferred income tax (benefit) expense	(9,881)	1,142	8,123
Net realized investment losses (gains)	1,187	(6,472)	(1,000)
Net unrealized investment losses (gains)	7,153	(1,363)	(679)
Credit loss expense - investments	0	0	611
Credit loss expense - reinsurance recoverable	364	5	(368)
Net (income) loss from unconsolidated joint venture	(495)	(417)	57
Distributions received from unconsolidated joint venture	489	114	0
Net (income) loss from limited partnership interests	(3,963)	(4,947)	1,595
Distributions received from limited partnership interests	3,001	3,604	1,215
Impairment loss	2,284	0	0
Loss on repurchases of convertible senior notes	0	0	150
Loss on extinguishment of debt	0	0	98
Debt conversion expense	0	1,754	0
Gain on involuntary conversion	(13,402)	0	(36,969)
Gain on sale of real estate investments	(376)	0	0
Gain from remeasurement of contingent liabilities	(3,117)	0	0
Foreign currency remeasurement loss	108	64	32
Other non-cash items	(47)	61	46
Changes in operating assets and liabilities:
Accrued interest and dividends receivable	(1,599)	235	1,028
Income taxes	1,277	470	(3,514)
Premiums receivable, net	33,159	225	(48,127)
Prepaid reinsurance premiums	(40,272)	10,021	(18,393)
Reinsurance recoverable	(612,073)	8,491	47,447
Deferred policy acquisition costs	12,173	(13,837)	(22,195)
Funds withheld for assumed business	24,944	(73,716)	0
Other assets	(15,581)	4,487	(4,578)
Losses and loss adjustment expenses	626,600	24,996	(2,528)
Unearned premiums	1,303	97,345	88,236
Advance premiums	4,816	2,401	5,781
Assumed reinsurance balances payable	0	(87)	11
Reinsurance payable on paid losses and loss adjustment expenses	4,589	4,017	0
Reinsurance recovered in advance on unpaid losses	19,863	0	0
Ceded reinsurance premiums payable	(1,672)	9,554	(3,431)
Accrued expenses and other liabilities	(8,397)	1,642	20,303
Net cash (used in) provided by operating activities	(12)	96,503	77,311
Cash flows from investing activities:
Investments in limited partnership interests	(1,967)	(3,756)	(4,241)
Distributions received from limited partnership interests	5,360	4,657	2,086
Distributions received from unconsolidated joint venture	351	623	0
Purchase of property and equipment	(6,341)	(3,318)	(6,437)
Purchase of real estate investments	(841)	(1,367)	(3,020)
Purchase of intangible assets	(3,800)	0	0
Purchase of fixed-maturity securities	(614,843)	(18,303)	(34,951)
Purchase of equity securities	(22,887)	(102,801)	(68,223)
Purchase of short-term and other investments	(42)	(1,307)	(200)
Compensation received for property relinquished through eminent domain	14,500	0	44,000
Proceeds from sales of real estate investments	667	0	0
Proceeds from sales of fixed-maturity securities	11,716	23,055	81,433
Proceeds from calls, repayments and maturities of fixed-maturity securities	151,415	23,430	84,459
Proceeds from sales of equity securities	31,605	112,310	47,312
Proceeds from sales, redemptions and maturities of short-term and other investments	570	3,629	997
Net cash (used in) provided by investing activities	(434,537)	36,852	143,215
Cash flows from financing activities:
Cash dividends paid	(15,233)	(14,065)	(12,694)
Cash dividends received under share repurchase forward contract	76	306	306
Net (repayment) borrowing under revolving credit facility	(15,000)	(8,750)	14,000
Proceeds from exercise of common stock options	0	0	63
Proceeds from issuance of redeemable noncontrolling interest and warrants	0	100,000	0
Issuance costs - redeemable noncontrolling interest	0	(6,262)	0
Cash dividends paid to redeemable noncontrolling interest	(5,508)	(2,542)	0
Proceeds from issuance of long-term debt	172,500	0	10,000
Repayment of long-term debt	(1,009)	(970)	(17,048)
Repurchases of convertible senior notes	0	0	(4,459)
Repurchases of common stock	(71,242)	(1,314)	(1,547)
Repurchases of common stock under share repurchase plan	(17,070)	0	(5,161)
Purchase of noncontrolling interests	(406)	(55)	0
Debt conversion expense paid	0	(1,895)	0
Debt issuance costs	(6,041)	(152)	(165)
Net cash provided by (used in) financing activities	41,067	64,301	(16,705)
Effect of exchange rate changes on cash	(98)	(54)	2
Net (decrease) increase in cash, cash equivalents, and restricted cash	(393,580)	197,602	203,823
Cash, cash equivalents and restricted cash at beginning of year	631,343	433,741	229,918
Cash, cash equivalents and restricted cash at end of year	237,763	631,343	433,741
Supplemental disclosure of cash flow information:
Cash paid for income taxes	146	2,379	6,202
Cash paid for interest	6,155	7,110	7,476
Non-cash investing and financing activities:
Unrealized loss on investments in available-for-sale securities, net of tax	(10,772)	(1,068)	(634)
Receivable from sales of equity securities	0	0	5,240
Payable on purchases of equity securities	0	0	7
Common stock issued on conversions of 4.25% senior notes	0	114,928	0
Warrants issued in Centerbridge transaction	0	9,217	0
Asset acquired under finance lease	0	6	0
Acquisition of intangibles:
Common stock issued	0	5,410	0
Contingent consideration payable	$ 1,069	$ 2,419	$ 0