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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fixed income securities, amortized cost | $ 5,539,759 | $ 4,992,756
Fixed income securities pledged as collateral, amortized cost | 64,667 | 64,612
Short-term investments, amortized cost | 436,759 | 225,789
Other investments | $ 294,376 | $ 285,261
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 20,000,000 | 20,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 130,000,000 | 130,000,000
Common stock, shares issued | 45,047,686 | 45,044,222
Common stock, shares outstanding | 45,047,686 | 45,044,222
Treasury stock, shares | 690 | 8,202

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