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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investments: |  |  |  |
Fixed-maturity securities available for sale, amortized cost | $ 1,983,956 | [1] | $ 1,877,326 | [2]
Fixed-maturity securities held to maturity, fair value | 838,637 |  | 779,472 |
Equity securities available for sale, amortized cost | 0 |  | 31,331 |
Equity securities, at fair value, historical cost | 36,711 |  | 0 |
Trading securities, amortized cost | 23,090 |  | 6,172 |
Intangible assets, net |  |  |  |
Accumulated amortization on definite-lived intangible assets | $ 80,335 |  | $ 78,633 |
Stockholders’ equity: |  |  |  |
Common stock, par value | $ 0.01 |  | $ 0.01 |
Common stock, shares authorized | 500,000,000 |  | 500,000,000 |
Common stock, shares issued | 43,168,000 |  | 44,251,000 |
Common stock, shares outstanding | 43,168,000 |  | 44,251,000 |
[1] | Includes $0.2 million of other-than-temporary impairment ("OTTI") losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2] | Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).

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