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Investments (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Number | Dec. 31, 2012 Number
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | $ 1,672,852 |  | $ 263,571 |
Fixed maturity securities, Fair Value More than 12 Months | 83,093 |  | 55,788 |
Fixed maturity securities, Fair Value, Total | 1,755,945 |  | 319,359 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 108,594 |  | 5,648 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 13,943 |  | 5,532 |
Fixed maturity securities, Gross Unrealized Losses, Total | 122,537 |  | 11,180 |
Number of positions with a gross unrealized loss 12 months or less | 534 |  | 156 |
Number of position with gross unrealized loss position more than 12 months | 46 |  | 43 |
Number of position with gross unrealized loss position Total | 580 |  | 199 |
Fair value as percentage of fixed maturities and equity securities fair value less than 12 months | 27.40% |  | 4.40% |
Fair value as percentage of fixed maturities and equity securities fair value more than 12 months | 1.40% |  | 0.90% |
Fair value as percentage of fixed maturities and equity securities fair value, Total | 28.80% |  | 5.30% |
Mortgage-backed securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 150,602 |  | 11,006 |
Fixed maturity securities, Fair Value More than 12 Months | 1,383 |  | 50 |
Fixed maturity securities, Fair Value, Total | 151,985 |  | 11,056 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 19,145 |  | 124 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 415 |  | 1 |
Fixed maturity securities, Gross Unrealized Losses, Total | 19,560 |  | 125 |
Other [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 249,765 |  | 9,944 |
Fixed maturity securities, Fair Value More than 12 Months | 4,450 |  | 0 |
Fixed maturity securities, Fair Value, Total | 254,215 |  | 9,944 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 22,479 |  | 135 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 872 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses, Total | 23,351 |  | 135 |
Municipal Bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 375,523 |  | 108,578 |
Fixed maturity securities, Fair Value More than 12 Months | 42,899 |  | 3,990 |
Fixed maturity securities, Fair Value, Total | 418,422 |  | 112,568 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 26,529 |  | 2,605 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 8,086 |  | 43 |
Fixed maturity securities, Gross Unrealized Losses, Total | 34,615 |  | 2,648 |
Foreign government bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 6,738 |  | 0 |
Fixed maturity securities, Fair Value More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Fair Value, Total | 6,738 |  | 0 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 390 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses, Total | 390 |  | 0 |
Corporate Bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 582,849 |  | 56,481 |
Fixed maturity securities, Fair Value More than 12 Months | 12,948 |  | 26,725 |
Fixed maturity securities, Fair Value, Total | 595,797 |  | 83,206 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 28,634 |  | 875 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 3,516 |  | 4,075 |
Fixed maturity securities, Gross Unrealized Losses, Total | 32,150 |  | 4,950 |
Other Mortgage-backed Securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 274,983 |  | 58,218 |
Fixed maturity securities, Fair Value More than 12 Months | 20,008 |  | 25,014 |
Fixed maturity securities, Fair Value, Total | 294,991 |  | 83,232 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 8,300 |  | 621 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 552 |  | 1,411 |
Fixed maturity securities, Gross Unrealized Losses, Total | 8,852 |  | 2,032 |
Total Fixed Maturities Securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 1,640,460 |  | 244,227 |
Fixed maturity securities, Fair Value More than 12 Months | 81,688 |  | 55,779 |
Fixed maturity securities, Fair Value, Total | 1,722,148 |  | 300,006 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 105,477 |  | 4,360 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 13,441 |  | 5,530 |
Fixed maturity securities, Gross Unrealized Losses, Total | 118,918 |  | 9,890 |
Equity Securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 32,392 | [1] | 19,344 | [1]
Fixed maturity securities, Fair Value More than 12 Months | 1,405 | [1] | 9 | [1]
Fixed maturity securities, Fair Value, Total | 33,797 | [1] | 19,353 | [1]
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 3,117 | [1] | 1,288 | [1]
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 502 | [1] | 2 | [1]
Fixed maturity securities, Gross Unrealized Losses, Total | $ 3,619 | [1] | $ 1,290 | [1]
[1] | Includes nonredeemable (perpetual) preferred stocks and common stocks.

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