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Collateral Finance Facility (Narrative Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Collateral Finance Facility [Line Items]      
Direct investment in subsidiary $ 112,800,000    
Assets held in trust and held in custody 909,200,000 896,100,000  
Collateral Financing Expense 12,197,000 12,391,000 7,856,000
Amount Held In Debt Service Coverage Account 33,200,000 33,500,000  
Repurchased Subsidiary Debt   198,500,000  
Repayments of Secured Debt 0 130,798,000 0
Gain on repurchase of long-term debt 0 65,565,000 0
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 35,000,000    
Timberlake Reinsurance Company [Member]
      
Collateral Finance Facility [Line Items]      
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 33,000,000    
Timerberlake Financial [Member]
      
Collateral Finance Facility [Line Items]      
Debt Instrument, Issuance Date June 2006    
Debt Instrument, Face Amount 850,000,000    
Collateral Financing Expense 6,900,000 7,100,000 7,900,000
Repayments of Secured Debt   130,800,000  
Gain on repurchase of long-term debt   65,600,000  
Manor Reinsurance [Member]
      
Collateral Finance Facility [Line Items]      
Debt Instrument, Face Amount 300,000,000    
Collateral Financing Expense $ 5,300,000 $ 5,300,000