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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Summarized financial information for these segments |  |  |
Insurance premiums and contract charges earned | $ 169,158 | $ 165,504 |
Net investment income | 77,403 | 75,675 |
Net income (loss) | 27,012 | 26,671 |
Assets | 8,457,354 |  | 8,167,726
Property and casualty [Member] |  |  |
Summarized financial information for these segments |  |  |
Insurance premiums and contract charges earned | 137,936 | 135,046 |
Net investment income | 8,970 | 8,872 |
Net income (loss) | 10,160 | 13,231 |
Assets | 1,018,363 |  | 1,016,368
Annuity [Member] |  |  |
Summarized financial information for these segments |  |  |
Insurance premiums and contract charges earned | 5,072 | 4,965 |
Net investment income | 51,354 | 49,540 |
Net income (loss) | 11,061 | 11,588 |
Assets | 5,624,351 |  | 5,380,780
Life [Member] |  |  |
Summarized financial information for these segments |  |  |
Insurance premiums and contract charges earned | 26,150 | 25,493 |
Net investment income | 17,319 | 17,512 |
Net income (loss) | 4,340 | 5,165 |
Assets | 1,718,125 |  | 1,663,696
Corporate and other [Member] |  |  |
Summarized financial information for these segments |  |  |
Net investment income |  |  |
Net income (loss) | 1,451 | (3,313) |
Assets | 123,282 |  | 131,449
Intersegment eliminations [Member] |  |  |
Summarized financial information for these segments |  |  |
Net investment income | (240) | (249) |
Assets | $ (26,767) |  | $ (24,567)

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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, and contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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