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Ceded Reinsurance (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Ceded Credit Risk [Line Items]
Reinsurance recoverable	$ 1,002,919	$ 927,588	$ 919,991	$ 888,314
Reinsurance recoverable on paid losses	652,158	529,927
Number of ceded reinsurers	4	4	4
Facultative Reinsurance [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverable	11,774	8,300
Treaty Reinsurance Net Reinsurance Recoverable [Member]
Ceded Credit Risk [Line Items]
Reinsurance recoverable on paid losses	42,266	40,794
Credit Concentration Risk [Member] \| Premiums Ceded [Member]
Ceded Credit Risk [Line Items]
Percentage of premiums ceded to reinsurers	54.00%	56.00%	57.00%
Commutation of variable rated excess of loss contracts [Member] \| Recurring Business [Member]
Ceded Credit Risk [Line Items]
Increase to ceded premium for recurring business	2,392	508
Commutation of variable rated excess of loss contracts [Member] \| Premiums Ceded [Member] \| Recurring Business [Member]
Ceded Credit Risk [Line Items]
Increase to ceded premium for recurring business	12,393	9,296
Commutation of variable rated excess of loss contracts [Member] \| Net Reduction [Member] \| Recurring Business [Member]
Ceded Credit Risk [Line Items]
Increase to ceded premium for recurring business	$ 14,785	$ 8,788

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

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