Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Net premiums earned	$ 447,288	$ 432,880	$ 328,145
Net investment income	26,249	22,048	18,095
Commissions and other income	9,171	9,932	5,308
Net realized gains (losses) on investments, excluding impairment losses	2,455	(6,632)	7,366
Other-than-temporary impairment losses on investments	(497)	(19)	(149)
Net unrealized gains (losses) on equity securities and limited partnership investments	10,931	(19,040)	12,469
Net realized and unrealized gains (losses) on investments	12,889	(25,691)	19,686
Total revenues	495,597	439,169	371,234
Expenses:
Losses and loss expenses incurred	348,468	345,864	247,518
Other operating expenses	138,456	137,177	113,594
Total expenses	486,924	483,041	361,112
Income (loss) before federal income tax expense (benefit)	8,673	(43,872)	10,122
Federal income tax expense (benefit)	1,326	(9,797)	(8,201)
Net income (loss)	$ 7,347	$ (34,075)	$ 18,323
Per share data:
Basic and diluted earnings (loss) (in dollars per share)	$ 0.50	$ (2.28)	$ 1.21