Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Net premiums earned	$ 252,743	$ 237,461	$ 244,570
Net investment income	8,770	9,930	10,729
Commissions and other income	5,944	5,722	6,098
Net realized gains (losses) on investments, excluding impairment losses	24,257	9,899	(15,897)
Total other-than-temporary impairment losses on investments	(744)	(894)	(1,987)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	2	6	81
Net realized gains (losses) on investments	23,515	9,011	(17,803)
Total revenue	290,972	262,124	243,594
Expenses:
Losses and loss expenses incurred	150,701	138,088	215,555
Other operating expenses	85,361	77,430	73,328
Total expenses	236,062	215,518	288,883
Income (loss) before federal income taxes	54,910	46,606	(45,289)
Federal income taxes (benefits)	18,322	14,687	(17,114)
Net income (loss)	$ 36,588	$ 31,919	$ (28,175)
Per share data:
Basic and diluted earnings (losses) (in dollars per share)	$ 2.45	$ 2.15	$ (1.90)