Unaudited Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Net premiums earned	$ 61,098	$ 61,551
Net investment income	2,410	2,422
Commissions and other income	1,383	1,506
Net realized gains on investments, excluding impairment losses	14,353	5,381
Total other-than-temporary impairment losses on investments	(6)	0
Net realized gains on investments	14,347	5,381
Total revenue	79,238	70,860
Expenses
Losses and loss expenses incurred	34,533	34,904
Other operating expenses	22,026	18,957
Total expenses	56,559	53,861
Income before federal income taxes	22,679	16,999
Federal income taxes	7,736	5,493
Net income	$ 14,943	$ 11,506
Per share data:
Basic and diluted earnings (in dollars per share)	$ 1.00	$ 0.78
Dividends paid to shareholders (in dollars per share)	$ 0.25	$ 0.25
Reconciliation of shares outstanding:
Average shares outstanding - basic (in shares)	14,878	14,826
Dilutive effect of share equivalents (in shares)	33	16
Average shares outstanding - diluted (in shares)	14,911	14,842