Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gross written premiums	$ 332,128	$ 322,987	$ 725,350	$ 666,136
Revenues:
Net written premiums	198,469	190,252	467,921	433,297
Change in unearned premiums	7,345	5,765	(59,779)	(54,161)
Net earned premiums	205,814	196,017	408,142	379,136
Net investment income	14,246	15,777	27,903	27,035
Total other-than-temporary impairment losses		(496)	(42)	(693)
Portion of loss recognized in other comprehensive income (before tax)				43
Net other-than-temporary impairment losses recognized in earnings		(496)	(42)	(650)
Net realized gains (losses)	3,345	4,217	8,159	6,059
Other income (expense)	(915)	387	(297)	1,298
Total revenues	222,490	215,902	443,865	412,878
Expenses:
Net losses and loss adjustment expenses	131,148	123,407	262,490	241,392
Commission expenses	28,391	29,503	54,946	58,953
Other operating expenses	40,678	39,819	81,552	76,126
Interest expense	2,052	2,049	4,103	4,098
Total expenses	202,269	194,778	403,091	380,569
Income (loss) before income taxes	20,221	21,124	40,774	32,309
Income tax expense (benefit)	6,284	6,225	12,927	9,506
Net income (loss)	$ 13,937	$ 14,899	$ 27,847	$ 22,803
Net income per common share:
Basic	$ 0.99	$ 1.06	$ 1.97	$ 1.63
Diluted	$ 0.97	$ 1.05	$ 1.93	$ 1.60
Average common shares outstanding:
Basic	14,131,422	14,006,361	14,108,747	13,992,901
Diluted	14,428,117	14,208,759	14,434,232	14,245,947