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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost $ 4,945,921 $ 5,346,897
Gross Unrealized Gains 548,581 627,588
Gross Unrealized Losses 104,212 144,196
Estimated Fair Value 5,390,290 5,830,289
Non - credit other - than - temporary Impairments 9,802 20,907
Other short-term investments amortized cost basis 1,009,868 783,015
Other short-term investments gross unrealized gain 193 57
Other short-term investments gross unrealized losses 2 1
Other Short-term Investments 1,010,059 783,071
Other investments amortized cost basis 100 100
Other Investments 100 100
Investment other than available for sale securities pledged as collateral amortized cost basis 5,955,889 6,130,012
Investment other than available for sale securities pledged as collateral gross unrealized gain 548,774 627,645
Investment other than available for sale securities pledged as collateral gross unrealized losses 104,214 144,197
Investment other than available for sale securities pledged as collateral 6,400,449 6,613,460
Amortized cost basis of securities pledged as collateral 286,115 261,958
Gross unrealized gains on securities pledged as collateral 797 1,696
Gross unrealized losses on securities pledged as collateral 252 124
Fair value of securities pledged as collateral 286,660 263,530
Amortized Cost on Investment 6,242,004 6,391,970
Gross Unrealized Gains On Investment 549,571 629,341
Gross Unrealized Loss On Investment 104,466 144,321
Estimated fair value on investments 6,687,109 6,876,990
Municipal obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 1,768,713 1,858,493
Gross Unrealized Gains 166,950 144,989
Gross Unrealized Losses 80 483
Estimated Fair Value 1,935,583 2,002,999
Corporate obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 1,040,010 1,087,629
Gross Unrealized Gains 76,454 63,074
Gross Unrealized Losses 13,769 23,203
Estimated Fair Value 1,102,695 1,127,500
Foreign obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 65,089 89,951
Gross Unrealized Gains 3,753 4,844
Estimated Fair Value 68,842 94,795
US government obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 109,927 107,717
Gross Unrealized Gains 1,507 3,847
Gross Unrealized Losses 45 2
Estimated Fair Value 111,389 111,562
Amortized cost basis of securities pledged as collateral 285,349 259,401
Gross unrealized gains on securities pledged as collateral 741 1,525
Gross unrealized losses on securities pledged as collateral 252 124
Fair value of securities pledged as collateral 285,838 260,802
U.S. agency obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 80,053 80,960
Gross Unrealized Gains 4,647 5,911
Estimated Fair Value 84,700 86,871
Residential Mortgage-backed Securities [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 1,065,132 1,119,517
Gross Unrealized Gains 249,879 350,816
Gross Unrealized Losses 40,487 57,816
Estimated Fair Value 1,274,524 1,412,517
Non - credit other - than - temporary Impairments 9,802 20,907
Amortized cost basis of securities pledged as collateral 766 2,557
Gross unrealized gains on securities pledged as collateral 56 171
Fair value of securities pledged as collateral 822 2,728
Collateralized debt obligations [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 42,099 48,686
Gross Unrealized Gains 481 142
Gross Unrealized Losses 1,214 2,591
Estimated Fair Value 41,366 46,237
Other asset-backed securities [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Amortized Cost 774,898 953,944
Gross Unrealized Gains 44,910 53,965
Gross Unrealized Losses 48,617 60,101
Estimated Fair Value 771,191 947,808
Short-term Investments [Member]
    
Summary of amortized cost and estimated fair value of investments, excluding VIE investments    
Other short-term investments gross unrealized losses $ 2 $ 1