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Securities in an Unrealized Loss Position (Non-Investment Grade Fixed Maturity Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Aggregate fair value of securities in a continuous unrealized loss position $ 3,001,158 $ 1,536,923
Mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Aggregate fair value of securities in a continuous unrealized loss position 582,747 543,023
Corporate
   
Schedule of Available-for-sale Securities [Line Items]    
Aggregate fair value of securities in a continuous unrealized loss position 1,139,372 442,318
State and municipal
   
Schedule of Available-for-sale Securities [Line Items]    
Aggregate fair value of securities in a continuous unrealized loss position 705,522 288,661
Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Aggregate fair value of securities in a continuous unrealized loss position 344,301 106,833
Noninvestment Grade Investments at Loss Less than 5 Million
   
Schedule of Available-for-sale Securities [Line Items]    
Number of securities 26  
Aggregate fair value of securities in a continuous unrealized loss position 136,471  
Gross Unrealized Loss 7,421  
Noninvestment Grade Investments at Loss Less than 5 Million | Mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Number of securities 12  
Aggregate fair value of securities in a continuous unrealized loss position 56,553  
Gross Unrealized Loss 4,141  
Noninvestment Grade Investments at Loss Less than 5 Million | Corporate
   
Schedule of Available-for-sale Securities [Line Items]    
Number of securities 10  
Aggregate fair value of securities in a continuous unrealized loss position 44,525  
Gross Unrealized Loss 2,534  
Noninvestment Grade Investments at Loss Less than 5 Million | State and municipal
   
Schedule of Available-for-sale Securities [Line Items]    
Number of securities 1  
Aggregate fair value of securities in a continuous unrealized loss position 10,864  
Gross Unrealized Loss 2  
Noninvestment Grade Investments at Loss Less than 5 Million | Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Number of securities 3  
Aggregate fair value of securities in a continuous unrealized loss position 24,529  
Gross Unrealized Loss $ 744