Consolidated Statements of Financial Position (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments:
Fixed maturities available-for-sale, cost	$ 667,966	$ 595,944
Fixed maturities held-to-maturity, fair value	232,891	223,533
Available-for-sale equity securities, amortized cost basis	68,787	45,883
Real estate held for investment, accumulated depreciation	1,575	1,429
Due premiums, allowance for doubtful accounts	$ 1,364	$ 1,429
Common Stock Class A [Member]
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0	$ 0
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