Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments:
Fixed maturities available-for-sale, cost	$ 603,947	$ 559,736
Fixed maturities held-to-maturity, fair value	174,966	193,739
Available-for-sale equity securities, amortized cost basis	52,553	52,744
Real estate held for investment, accumulated depreciation	1,321	1,287
Due premiums, allowance for doubtful accounts	$ 1,285	$ 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 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