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Deferred Policy Acquisition Costs (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred Policy Acquisition Costs Disclosures [Line Items]    
Deferred policy acquisition costs $ 3,619,274,000 $ 3,543,925,000
Deferred Policy Acquisition Costs Assumed [Member]
    
Deferred Policy Acquisition Costs Disclosures [Line Items]    
Deferred policy acquisition costs 3,677,804,000 3,605,611,000
Deferred Policy Acquisition Costs Retroceded [Member]
    
Deferred Policy Acquisition Costs Disclosures [Line Items]    
Deferred policy acquisition costs $ (58,530,000) $ (61,686,000)