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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for Sale Amortized Cost    
Due in one year or less $ 833,834  
Due after one year through five years 1,299,010  
Due after five years through ten years 587,882  
Due after ten years 489,332  
Total 4,110,133 4,838,695 [1]
Available for Sale Securities Fair Value    
Due in one year or less 868,462  
Due after one year through five years 1,425,074  
Due after five years through ten years 681,147  
Due after ten years 597,556  
Total 4,527,910 5,273,767 [1]
Residential Mortgage Backed Securities [Member]
   
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 323,350  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date 341,157  
Commercial Mortgage Backed Securities [Member]
   
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 399,534  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date 429,529  
Asset-backed Securities [Member]
   
Available for Sale Amortized Cost    
Debt Maturities, without single maturity date 177,191  
Available for Sale Securities Fair Value    
Debt Maturities, without Single Maturity Date $ 184,985  
[1] Prior period’s amounts are presented on a basis consistent with the current period presentation.