Schedule III - Supplementary Insurance Information (Details) (Property and Casualty Insurance, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property and Casualty Insurance
Supplementary Insurance Information
Deferred Policy Acquisition Costs	$ 63,388	$ 60,665	$ 56,715
Future Policy Benefits, Losses, Claims and Loss Expenses	455,014	423,842	403,872
Unearned Premiums	370,583	353,219	329,562
Premium Revenue	681,870	642,469	598,368
Net Investment Income	43,054	40,870	39,060
Benefits, Claims, Losses, and Settlement Expenses	447,749	422,217	466,640
Other Operating Expenses	83,557	81,288	68,362
Premiums Written	697,540	663,942	620,316
Amortization of Deferred Policy Acquisition Costs	$ 126,201	$ 118,850	$ 110,795