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Investments (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | $ 1,340,259 |  | $ 263,571 |
Fixed maturity securities, Fair Value More than 12 Months | 60,009 |  | 55,788 |
Fixed maturity securities, Fair Value, Total | 1,400,268 |  | 319,359 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 70,090 |  | 5,648 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 5,890 |  | 5,532 |
Fixed maturity securities, Gross Unrealized Losses, Total | 75,980 |  | 11,180 |
Number of positions with a gross unrealized loss 12 months or less | 435 |  | 156 |
Number of position with gross unrealized loss position more than 12 months | 33 |  | 43 |
Number of position with gross unrealized loss position, Total | 468 |  | 199 |
Fair value as percentage of total fixed maturities and equity securities fair value less than 12 months | 22.30% |  | 4.40% |
Fair value as percentage of total fixed maturities and equity securities fair value more than 12 months | 1.00% |  | 0.90% |
Fair value as percentage of total fixed maturities and equity securities fair value, Total | 23.30% |  | 5.30% |
Mortgage-backed securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 103,346 |  | 11,006 |
Fixed maturity securities, Fair Value More than 12 Months | 44 |  | 50 |
Fixed maturity securities, Fair Value, Total | 103,390 |  | 11,056 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 6,165 |  | 124 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 0 |  | 1 |
Fixed maturity securities, Gross Unrealized Losses, Total | 6,165 |  | 125 |
Other [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 167,405 |  | 9,944 |
Fixed maturity securities, Fair Value More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Fair Value, Total | 167,405 |  | 9,944 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 11,420 |  | 135 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses, Total | 11,420 |  | 135 |
Municipal bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 302,729 |  | 108,578 |
Fixed maturity securities, Fair Value More than 12 Months | 9,551 |  | 3,990 |
Fixed maturity securities, Fair Value, Total | 312,280 |  | 112,568 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 19,486 |  | 2,605 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 837 |  | 43 |
Fixed maturity securities, Gross Unrealized Losses, Total | 20,323 |  | 2,648 |
Foreign government bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 5,762 |  | 0 |
Fixed maturity securities, Fair Value More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Fair Value, Total | 5,762 |  | 0 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 216 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 0 |  | 0 |
Fixed maturity securities, Gross Unrealized Losses, Total | 216 |  | 0 |
Corporate bonds [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 541,977 |  | 56,481 |
Fixed maturity securities, Fair Value More than 12 Months | 13,749 |  | 26,725 |
Fixed maturity securities, Fair Value, Total | 555,726 |  | 83,206 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 24,891 |  | 875 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 3,484 |  | 4,075 |
Fixed maturity securities, Gross Unrealized Losses, Total | 28,375 |  | 4,950 |
Other mortgage-backed securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 189,646 |  | 58,218 |
Fixed maturity securities, Fair Value More than 12 Months | 35,632 |  | 25,014 |
Fixed maturity securities, Fair Value, Total | 225,278 |  | 83,232 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 6,986 |  | 621 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 1,146 |  | 1,411 |
Fixed maturity securities, Gross Unrealized Losses, Total | 8,132 |  | 2,032 |
Total fixed maturities securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 1,310,865 |  | 244,227 |
Fixed maturity securities, Fair Value More than 12 Months | 58,976 |  | 55,779 |
Fixed maturity securities, Fair Value, Total | 1,369,841 |  | 300,006 |
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 69,164 |  | 4,360 |
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 5,467 |  | 5,530 |
Fixed maturity securities, Gross Unrealized Losses, Total | 74,631 |  | 9,890 |
Equity securities [Member] |  |  |  |
Fixed maturity securities Fair Value |  |  |  |
Fixed maturity securities, Fair Value 12 Months or Less | 29,394 | [1] | 19,344 | [1]
Fixed maturity securities, Fair Value More than 12 Months | 1,033 | [1] | 9 | [1]
Fixed maturity securities, Fair Value, Total | 30,427 | [1] | 19,353 | [1]
Fixed maturity securities Gross Unrealized Losses |  |  |  |
Fixed maturity securities, Gross Unrealized Losses 12 Months or Less | 926 | [1] | 1,288 | [1]
Fixed maturity securities, Gross Unrealized Losses More than 12 Months | 423 | [1] | 2 | [1]
Fixed maturity securities, Gross Unrealized Losses, Total | $ 1,349 | [1] | $ 1,290 | [1]
[1] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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