Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Net premiums earned	$ 276,011	$ 263,335	$ 261,627
Net investment income	14,483	12,498	9,055
Commissions and other income	5,275	5,703	6,430
Net realized gains on investments, excluding impairment losses	28,971	6,439	15,619
Total other-than-temporary impairment losses on investments	(5,743)	(7,700)	(689)
Net realized gains (losses) on investments	23,228	(1,261)	14,930
Total revenue	318,997	280,275	292,042
Expenses:
Losses and loss expenses incurred	186,481	155,750	159,596
Other operating expenses	89,462	90,573	88,048
Total expenses	275,943	246,323	247,644
Income before federal income taxes	43,054	33,952	44,398
Federal income taxes	14,109	10,669	14,681
Net income	$ 28,945	$ 23,283	$ 29,717
Per share data:
Basic and diluted earnings (in dollars per share)	$ 1.92	$ 1.55	$ 1.98