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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost $ 5,136,280 $ 4,984,389
Unrealized Gains 655,608 470,496
Unrealized Losses 9,836 33,053
Fair value of issued securities 5,782,052 5,421,832
OTTI in AOCI 3,039 2,136
Equity securities Amortized Cost/Cost 37,292 23,070
Equity securities Fair Value 39,211 26,774
Mortgage-backed securities [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 548,160 532,554
Unrealized Gains 78,745 71,402
Unrealized Losses 8 144
Fair value of issued securities 626,897 603,812
OTTI in AOCI     
Other [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 423,863 560,036
Unrealized Gains 39,716 43,705
Unrealized Losses 1  
Fair value of issued securities 463,578 603,741
OTTI in AOCI     
Municipal bonds [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 1,374,655 1,291,281
Unrealized Gains 185,834 122,857
Unrealized Losses 1,280 1,020
Fair value of issued securities 1,559,209 1,413,118
OTTI in AOCI     
Foreign government bonds [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 48,489 44,529
Unrealized Gains 8,484 5,095
Unrealized Losses     
Fair value of issued securities 56,973 49,624
OTTI in AOCI     
Corporate bonds [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 2,147,783 1,967,229
Unrealized Gains 302,751 205,413
Unrealized Losses 6,359 16,098
Fair value of issued securities 2,444,175 2,156,544
OTTI in AOCI     
Other mortgage-backed securities [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Amortized Cost/Cost 593,330 588,760
Unrealized Gains 40,078 22,024
Unrealized Losses 2,188 15,791
Fair value of issued securities 631,220 594,993
OTTI in AOCI 3,039 2,136
Equity securities [Member]
    
Summary of fair value and gross unrealized losses of fixed maturity securities and equity securities in an unrealized loss position    
Unrealized Gains 2,673 4,030
Unrealized Losses 754 326
OTTI in AOCI     
Equity securities Amortized Cost/Cost 37,292 23,070
Equity securities Fair Value $ 39,211 $ 26,774