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4. Sources of Net Investment Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sources Of Net Investment Income Details        
Debt securities $ 31,471 $ 23,390 $ 61,066 $ 43,832
Policy loans 805 773 1,587 1,493
Limited partnerships and other investments 759 388 923 588
Fair value option investments (48) 146 48 420
Cash and cash equivalents 0 1 0 5
Total investment income 32,987 24,698 63,624 46,338
Less: Investment expenses 189 467 564 709
Net investment income $ 32,798 $ 24,231 $ 63,060 $ 45,629