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Reinsurance Receivables Level 4 Reinsurer concentration of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Reinsurance Disclosures [Abstract]
Total recoverable from three unrelated reinsurers	$ 124,311	$ 124,160

- Definition

Amount of reported and estimated unreported claims assumed by and receivable from the identified reinsurer with respect to disclosure of a concentration of credit risk.

+ References+ Details