Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (21,006)	$ 70,015	$ (56,696)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization and depreciation	7,027	7,103	7,019
Amortization of debt issuance costs	217	264	264
Restricted stock and stock option expense	6,774	4,221	3,452
Deferred federal income taxes	(8,268)	11,783	(19,554)
Amortization of bond premium and discount, net	6,957	4,887	5,925
Net realized investment (gains) losses	14,662	(35,342)	16,907
Loss on extinguishment of debt	3,060	0	0
Loss from equity method investments, net of distributions	6,346	0	0
Changes in:
Premiums receivable, net	8,604	(30,356)	(3,293)
Reinsurance receivables, net	(4,770)	30,480	(9,358)
Funds held by ceding insurers	4,294	928	(5,791)
Unpaid losses and loss adjustment expenses	32,630	(49,850)	45,367
Unearned premiums	(23,366)	32,949	(3,485)
Ceded balances payable	(11,461)	5,410	4,143
Other assets and liabilities	(8,240)	(16,162)	46,823
Contingent commissions	(1,096)	1,292	2,652
Federal income tax receivable/payable	10,989	(123)	(534)
Deferred acquisition costs	5,482	(9,001)	(29)
Prepaid reinsurance premiums	3,835	3,878	8,257
Net cash provided by operating activities	32,670	32,376	42,069
Cash flows from investing activities:
Proceeds from sale of fixed maturities	791,554	977,321	293,348
Proceeds from sale of equity securities	604,772	260,891	35,639
Proceeds from maturity of fixed maturities	119,326	180,546	55,182
Proceeds from other invested assets	4,211	16,757	43,377
Amounts received (paid) in connection with derivatives	(20,456)	(7,654)	4,392
Purchases of fixed maturities	(808,618)	(1,129,567)	(370,536)
Purchases of equity securities	(455,907)	(365,255)	(36,258)
Purchases of other invested assets	(60,297)	(13,283)	(16,309)
Acquisition of business	0	0	(3,515)
Net cash provided by (used for) investing activities	174,585	(80,244)	5,320
Cash flows from financing activities:
Net borrowings (repayments) under margin borrowing facility	(73,629)	7,811	(6,412)
Dividends paid to common shareholders	(14,252)	(14,222)	(14,027)
Distributions paid to preferred shareholders	(133)	0	0
Issuance of series A cumulative fixed rate preferred shares	4,000	0	0
Purchases of class A common shares	153	947	1,867
Redemption of subordinated notes	100,000	0	0
Net cash used for financing activities	(184,167)	(7,358)	(22,306)
Net change in cash and cash equivalents	23,088	(55,226)	25,083
Cash and cash equivalents at beginning of period	44,271	99,497	74,414
Cash and cash equivalents at end of period	$ 67,359	$ 44,271	$ 99,497