|
Fair Value Measurements (Details Textual) (USD $)
|
Jun. 30, 2012
Securities
|
Dec. 31, 2011
|
|---|---|---|
| Fair Value Measurements (Textual) [Abstract] | ||
| Fixed maturity securities available for sale, at fair value | $ 2,816,250,000 | $ 2,682,142,000 |
| Fair Value Measurements (Additional Textual) [Abstract] | ||
| Percentage of carrying value of investments from external pricing services | 96.00% | |
| Percentage of carrying value of investments from brokers | 2.00% | |
| Percentage of carrying value of investments from internal matrices and calculations | 2.00% | |
| Number of securities on which company internally determined the prices | 20 | |
| Prices obtained for the number of securities from brokers | 7 | |
|
Level 3 [Member]
|
||
| Fair Value Measurements (Textual) [Abstract] | ||
| Fixed maturity securities available for sale, at fair value | 44,999,000 | 43,759,000 |
| Fair Value Measurements (Additional Textual) [Abstract] | ||
| Estimated increase in Basis Spread of fixed maturity securities | 0.10% | |
| Reduction in reported fair value | $ 200,000 |