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Investment Information (Details - Other Than Temporary Impairments Recognized In Earnings) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings$ 2,739$ 2,075$ 7,103$ 8,091
Fixed maturities [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings1,2082,0754,0056,438
Fixed maturities [Member] | Mortgage backed securities [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings1,1921,8353,6204,096
Fixed maturities [Member] | Asset backed securities [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings0103102,077
Fixed maturities [Member] | Corporate bonds [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings16137375265
Investment of funds received under securities lending arrangements [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings39301,6231,653
Equity securities [Member]
    
Other than temporary impairments recognized in earnings by asset class:    
Net impairment losses recognized in earnings$ 1,138$ 0$ 1,475$ 0