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Comprehensive Income (Details 1) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Comprehensive income |  |  |
Fixed maturity securities available-for-sale | $ 22,291,614,000 | $ 16,200,950,000 |
Other invested assets | 1,159,543,000 | 1,012,541,000 |
Deferred policy acquisition costs | 3,619,274,000 | 3,543,925,000 |
Accumulated Other Comprehensive Income Loss Change In Component During Period | 705,021,000 | 1,043,844,000 | 814,436,000
Change In Net Unrealized Appreciation Depreciation [Member] |  |  |
Comprehensive income |  |  |
Fixed maturity securities available-for-sale | 713,778,000 | 1,058,505,000 | 813,174,000
Other invested assets | 6,181,000 | (7,213,000) | 16,933,000
Effect On Unrealized Appreciation Depreciation [Member] |  |  |
Comprehensive income |  |  |
Deferred policy acquisition costs | $ (14,938,000) | $ (7,448,000) | $ (15,671,000)

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