Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Net premiums earned	$ 445,515	$ 447,288	$ 432,880
Net investment income	25,422	26,249	22,048
Commissions and other income	7,048	9,171	9,932
Net realized gains (losses) on investments, excluding impairment losses	(6,876)	2,455	(6,632)
Impairment losses on investments	(2,861)	(497)	(19)
Net unrealized gains (losses) on equity securities and limited partnership investments	501	10,931	(19,040)
Net realized and unrealized gains (losses) on investments	(9,236)	12,889	(25,691)
Total revenues	468,749	495,597	439,169
Expenses:
Losses and loss expenses incurred	318,958	348,468	345,864
Other operating expenses	143,428	138,456	137,177
Total expenses	462,386	486,924	483,041
Income (loss) before federal income tax expense (benefit)	6,363	8,673	(43,872)
Federal income tax expense (benefit)	1,900	1,326	(9,797)
Net income (loss)	$ 4,463	$ 7,347	$ (34,075)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.32	$ 0.51	$ (2.28)
Diluted (in dollars per share)	$ 0.31	$ 0.50	$ (2.28)
Weighted average number of shares outstanding:
Basic (in shares)	14,140,178	14,520,815	14,964,812
Dilutive effect of share equivalents (in shares)	129,806	99,118	0
Diluted (in shares)	14,269,984	14,619,933	14,964,812