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Fair Value Measurements (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investments:    
Fixed maturity securities available for sale, carrying value $ 2,816,250 $ 2,682,142
Available for sale, fair value 2,853,434 2,718,831
Equity securities available for sale, at carrying value 37,184 36,689
Equity securities available for sale, at fair value 37,184 36,689
Mortgage loans, carrying value 582,017 604,772
Mortgage loans, fair value 623,887 642,905
Policy loans, carrying value 79,447 80,375
Policy loans, fair value 79,447 80,375
Cash and short-term investments, carrying value 23,021 59,752
Cash and short-term investments, fair value 23,021 59,752
Separate account assets, carrying value 320,566 316,609
Separate account assets, fair value 320,566 316,609
Liabilities:    
Individual and group annuities, carrying value 1,112,283 1,082,324
Individual and group annuities, fair value 1,091,546 1,062,407
Supplementary contracts without life contingencies, carrying value 54,898 56,193
Supplementary contracts without life contingencies, fair value 53,872 54,824
Separate account liabilities, carrying value 320,566 316,609
Separate account liabilities, fair value 320,566 316,609
Other policyholder funds - GMWB, carrying value (278) 187
Other policyholder funds - GMWB, fair value $ (278) $ 187