Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturities available-for-sale, amortized cost	$ 585,127	$ 559,736
Fixed maturities held-to-maturity, fair value	221,115	193,739
Available-for-sale equity securities, amortized cost	52,392	52,744
Real estate held for investment, accumulated depreciation	1,392	1,287
Due premiums, allowance for doubtful accounts	$ 1,296	$ 1,345
Common Stock Class A [Member]
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.00	$ 0.00
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	52,215,852	52,215,852
Common stock, shares outstanding (in shares)	52,215,852	52,215,852
Common stock, shares in treasury (in shares)	3,135,738	3,135,738
Common Stock Class B [Member]
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.00	$ 0.00
Common stock, shares authorized (in shares)	2,000,000	2,000,000
Common stock, shares issued (in shares)	1,001,714	1,001,714
Common stock, shares outstanding (in shares)	1,001,714	1,001,714