5. Investments of Account Balances With Guarantees (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fixed Annuity Contracts With Guarantees
Debt securities	$ 1,227,878	$ 972,354
Equity funds	0	0
Other	0	0
Total	1,227,878	972,354
Variable Annuity Contracts With Guarantees
Debt securities	375,187	395,540
Equity funds	1,520,692	1,537,736
Other	57,278	58,300
Total	$ 1,953,157	$ 1,991,576