|
Investments - Realized and Unrealized Gains on Investment (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
|
| Gain (Loss) on Investments [Line Items] | |||||
| Gross gains | $ 477 | $ 2,410 | $ 3,760 | $ 2,430 | |
| Gross losses | 0 | 0 | (53) | (1,594) | |
| Realized gains (losses), Net | 477 | 2,410 | 3,707 | 836 | |
| Proceeds from sales of fixed maturities classified as available-for-sale | 186,957 | 120,865 | |||
| Net unrealized gains | 54,704 | 54,704 | 143,797 | ||
| Deferred income tax expense | (111) | (111) | (132) | ||
| Net unrealized gains, net of deferred income tax | 54,593 | 54,593 | 143,665 | ||
| Change in net unrealized gains, net of deferred income tax | (89,072) | 79,928 | |||
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Available-for-sale securities [Member]
|
|||||
| Gain (Loss) on Investments [Line Items] | |||||
| Gross gains | 448 | 2,374 | 3,560 | 2,374 | |
| Gross losses | 0 | 0 | 0 | 0 | |
| Realized gains (losses), Net | 448 | 2,374 | 3,560 | 2,374 | |
| Net unrealized gains | 54,198 | 54,198 | 143,495 | ||
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Trading Securities and Short Sales [Member]
|
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| Gain (Loss) on Investments [Line Items] | |||||
| Gross gains | 0 | ||||
| Gross losses | (1,593) | ||||
| Realized gains (losses), Net | (1,593) | ||||
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Other investments [Member]
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| Gain (Loss) on Investments [Line Items] | |||||
| Gross gains | 29 | 36 | 200 | 56 | |
| Gross losses | 0 | 0 | (53) | (1) | |
| Realized gains (losses), Net | 29 | 36 | 147 | 55 | |
| Net unrealized gains | $ 506 | $ 506 | $ 302 | ||