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Reinsurance Receivables Table of Reinsurance Concentration of Credit Risk (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Concentration Risk [Line Items]    
Total of the three largest receivable balances from unrelated reinsurers $ 381,163 $ 352,926
Customer Concentration Risk    
Concentration Risk [Line Items]    
Total of the three largest receivable balances from unrelated reinsurers $ 167,472