BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fixed maturity available-for-sale securities, amortized cost	$ 1,756,299	$ 1,688,276
Equity available-for-sale securities, cost	$ 38,761	$ 36,145
Common stock, par value	$ 10	$ 10
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	250,000	250,000
Common stock, shares outstanding	250,000	250,000