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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Statement of Financial Position [Abstract] |  |
Fixed income securities, amortized cost | $ 5,941,188 | $ 5,927,254
Fixed income securities pledged as collateral, amortized cost | 64,323 | 126,196
Short-term investments, amortized cost | $ 550,898 | $ 271,118
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 | 45,004,410 | 45,003,461
Common stock, shares outstanding | 45,004,410 | 45,003,461
Treasury stock, shares | 937 | 937

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