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Reinsurance Receivables Reinsurer concentration of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total of the three largest receivable balances from unrelated reinsurers	$ 211,835	$ 203,988
Total of the three largest receivable balances from unrelated reinsurers
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total of the three largest receivable balances from unrelated reinsurers	$ 135,462	$ 126,633

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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