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Investments - Reconciliation of Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by Company (Details) (USD $)
In Thousands, unless otherwise specified
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3 Months Ended |
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Mar. 31, 2013
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| Credit Losses Recognized in Earnings on Fixed Maturity Securities [Roll Forward] |
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| Credit losses on securities held at beginning of the period in accumulated other comprehensive income |
$ 15,260 |
| Additions for credit losses not previously recognized in other-than-temporary impairment |
27 |
| Additions for increases in the credit loss for which an other-than-temporary impairment was previously recognized when there was no intent to sell the security before recovery of its amortized cost basis |
102 |
| Reductions for securities sold during the period (realized) |
0 |
| Reductions for securities previously recognized in other comprehensive income because of intent to sell the security before recovery of its amortized cost basis |
0 |
| Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security |
(5) |
| Credit losses on securities held at the end of the period in accumulated other comprehensive income |
$ 15,384 |