Schedule VI -Supplemental Information Concerning Property-Casualty Insurance Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Policy Acquisition Costs	$ 24,911	$ 22,554	$ 20,933
Reserves for Unpaid Claims and Claim Adjustment Expenses	313,416	296,945	251,677
Discount if any, Deducted In Column C	0	0	0
Unearned Premiums	162,502	146,104	140,965
Earned Premiums	319,436	293,041	278,271
Net Investment Income	15,293	15,880	14,849
Claims and Claim Adjustment Expenses Incurred Related to Current Year	230,089	222,869	193,354
Claims and Claim Adjustment Expenses Incurred Related to Prior Years	(3,675)	16,366	9,190
Amortization of Deferred Policy Acquisition Costs	59,805	47,775	55,994
Paid Claims and Claims Adjustment Expenses	217,483	206,873	165,071
Premiums Written	$ 332,489	$ 303,876	$ 281,641