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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Balance Sheet Related Disclosures [Abstract] |  |
Fixed maturities, held-to-maturity securities, fair value | $ 667 | $ 675
Fixed maturities, available-for-sale securities, amortized cost | 2,770,718 | 2,793,069
Fixed maturities, trading securities, amortized cost | 11,537 | 11,475
Equity securities, available-for-sale securities, amortized cost | 68,724 | 68,514
Equity securities, trading securities, amortized cost | 4,443 | 4,443
Allowance for doubtful accounts | 1,039 | 867
Property and equipment accumulated depreciation | $ 47,393 | $ 46,590
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized | 75,000,000 | 75,000,000
Common stock, shares issued | 25,324,068 | 25,151,428
Common stock, shares outstanding | 25,324,068 | 25,151,428

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