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Consolidated Statements of Financial Position (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investments: |  |
Fixed maturities available-for-sale, cost | $ 769,044 | $ 714,137
Fixed maturities held-to-maturity, fair value | 265,186 | 264,966
Available-for-sale equity securities, amortized cost basis | 23,727 | 23,727
Real estate held for investment, accumulated depreciation | 1,758 | 1,721
Due premiums, allowance for doubtful accounts | $ 1,362 | $ 1,490
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

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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