Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments:
Fixed maturities available-for-sale, cost	$ 1,293,853	$ 1,223,747
Real estate held for investment, accumulated depreciation	0	1,284
Real estate held for sale, accumulated depreciation	$ 1,325	$ 4,411
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)	52,364,993	52,215,852
Common stock, shares outstanding (in shares)	52,364,993	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	$ 0
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