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Investment Information (Details - Aging of Available For Sale Securities in an Unrealized Loss Position) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months$ 2,909,685$ 2,745,782
Gross Unrealized Losses - Less than 12 months(127,475)(67,397)
Estimated Fair Value - 12 months or more118,493165,601
Gross Unrealized Losses - 12 months or more(18,219)(17,653)
Estimated Fair Value3,028,1782,911,383
Gross unrealized losses(145,694)(85,050)
Fixed maturities fair value [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months2,463,1012,588,373
Gross Unrealized Losses - Less than 12 months(76,807)(62,565)
Estimated Fair Value - 12 months or more115,587162,751
Gross Unrealized Losses - 12 months or more(17,803)(17,237)
Estimated Fair Value2,578,6882,751,124
Gross unrealized losses(94,610)(79,802)
Fixed maturities fair value [Member] | Corporate bonds [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months946,958530,956
Gross Unrealized Losses - Less than 12 months(38,638)(16,580)
Estimated Fair Value - 12 months or more39,64020,351
Gross Unrealized Losses - 12 months or more(3,592)(1,763)
Estimated Fair Value986,598551,307
Gross unrealized losses(42,230)(18,343)
Fixed maturities fair value [Member] | Mortgage backed securities [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months377,312913,138
Gross Unrealized Losses - Less than 12 months(11,221)(20,331)
Estimated Fair Value - 12 months or more41,75957,895
Gross Unrealized Losses - 12 months or more(9,889)(6,562)
Estimated Fair Value419,071971,033
Gross unrealized losses(21,110)(26,893)
Fixed maturities fair value [Member] | Municipal bonds [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months243,629294,978
Gross Unrealized Losses - Less than 12 months(2,197)(6,440)
Estimated Fair Value - 12 months or more3,1748,465
Gross Unrealized Losses - 12 months or more(125)(518)
Estimated Fair Value246,803303,443
Gross unrealized losses(2,322)(6,958)
Fixed maturities fair value [Member] | Commercial mortgage backed securities [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months193,318311,703
Gross Unrealized Losses - Less than 12 months(3,453)(5,273)
Estimated Fair Value - 12 months or more8,40822,030
Gross Unrealized Losses - 12 months or more(777)(755)
Estimated Fair Value201,726333,733
Gross unrealized losses(4,230)(6,028)
Fixed maturities fair value [Member] | US government and government agencies [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months149,684190,497
Gross Unrealized Losses - Less than 12 months(536)(5,696)
Estimated Fair Value - 12 months or more00
Gross Unrealized Losses - 12 months or more00
Estimated Fair Value149,684190,497
Gross unrealized losses(536)(5,696)
Fixed maturities fair value [Member] | Non-US government securities [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months351,494271,446
Gross Unrealized Losses - Less than 12 months(14,840)(7,418)
Estimated Fair Value - 12 months or more11,89045,884
Gross Unrealized Losses - 12 months or more(770)(4,476)
Estimated Fair Value363,384317,330
Gross unrealized losses(15,610)(11,894)
Fixed maturities fair value [Member] | Asset backed securities [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months200,70675,655
Gross Unrealized Losses - Less than 12 months(5,922)(827)
Estimated Fair Value - 12 months or more10,7168,126
Gross Unrealized Losses - 12 months or more(2,650)(3,163)
Estimated Fair Value211,42283,781
Gross unrealized losses(8,572)(3,990)
Equity securities [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months193,35668,629
Gross Unrealized Losses - Less than 12 months(36,171)(3,424)
Estimated Fair Value - 12 months or more00
Gross Unrealized Losses - 12 months or more00
Estimated Fair Value193,35668,629
Gross unrealized losses(36,171)(3,424)
Other investments fair value [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months103,16746,750
Gross Unrealized Losses - Less than 12 months(6,229)(916)
Estimated Fair Value - 12 months or more2,9062,850
Gross Unrealized Losses - 12 months or more(416)(416)
Estimated Fair Value106,07349,600
Gross unrealized losses(6,645)(1,332)
Short-term investments [Member]
  
Fixed maturities and fixed maturities pledged under securities lending agreements:  
Estimated Fair Value - Less than 12 months150,06142,030
Gross Unrealized Losses - Less than 12 months(8,268)(492)
Estimated Fair Value - 12 months or more00
Gross Unrealized Losses - 12 months or more00
Estimated Fair Value150,06142,030
Gross unrealized losses$ (8,268)$ (492)