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Investments - Schedule of Distribution of Maturities for Fixed Maturity Securities Available for Sale (Details) (USD $)
In Thousands, unless otherwise specified
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Sep. 30, 2014
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Dec. 31, 2013
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| Investments [Abstract] |
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|
| Due in one year or less, Amortized Cost |
$ 130,310 |
|
| Due after one year through five years, Amortized Cost |
744,106 |
|
| Due after five years through ten years, Amortized Cost |
1,043,438 |
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| Due after ten years, Amortized Cost |
439,637 |
|
| Securities with variable principal payments, Amortized Cost |
205,673 |
|
| Redeemable preferred stocks, Amortized Cost |
17,481 |
|
| Available for sale securities, Amortized Cost, Total |
2,580,645 |
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| Due in one year or less, Fair value |
132,753 |
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| Due after one year through five years, Fair Value |
813,075 |
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| Due after five years through ten years, Fair Value |
1,081,193 |
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| Due after ten years, Fair Value |
488,244 |
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| Securities with variable principal payments, Fair Value |
219,948 |
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| Redeemable preferred stocks, Fair Value |
16,703 |
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| Fixed maturity securities available for sale, Carrying Value, Total |
$ 2,751,916 |
$ 2,618,620 |