Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gross written premiums	$ 312,076	$ 298,742	$ 1,037,426	$ 964,878
Revenues:
Net written premiums	196,556	188,046	664,477	621,343
Change in unearned premiums	17,339	13,216	(42,440)	(40,945)
Net earned premiums	213,895	201,262	622,037	580,398
Net investment income	14,094	13,597	41,997	40,632
Total other-than-temporary impairment losses	(1,821)		(1,863)	(693)
Portion of loss recognized in other comprehensive income (before tax)				43
Net other-than-temporary impairment losses recognized in earnings	(1,821)		(1,863)	(650)
Net realized gains (losses)	(988)	4,761	7,171	10,820
Other income (expense)	(210)	789	(507)	2,087
Total revenues	224,970	220,409	668,835	633,287
Expenses:
Net losses and loss adjustment expenses	125,086	128,850	387,576	370,242
Commission expenses	27,685	31,258	82,631	90,211
Other operating expenses	39,056	40,112	120,608	116,238
Interest expense	2,053	2,049	6,156	6,147
Total expenses	193,880	202,269	596,971	582,838
Income (loss) before income taxes	31,090	18,140	71,864	50,449
Income tax expense (benefit)	9,804	5,225	22,731	14,731
Net income (loss)	$ 21,286	$ 12,915	$ 49,133	$ 35,718
Net income per common share:
Basic	$ 1.50	$ 0.92	$ 3.48	$ 2.55
Diluted	$ 1.48	$ 0.90	$ 3.42	$ 2.51
Average common shares outstanding:
Basic	14,144,478	14,026,855	14,120,788	14,004,302
Diluted	14,408,413	14,272,477	14,379,943	14,255,301