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Investments (Investment Income Net of Related Expenses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 462,804 | $ 382,503 | $ 1,306,241 | $ 1,277,309
Investment expense | (15,698) | (13,137) | (44,153) | (38,578)
Investment income, net of related expenses | 447,106 | 369,366 | 1,262,088 | 1,238,731
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 269,346 | 243,938 | 766,764 | 723,772
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 39,070 | 33,013 | 102,535 | 89,618
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 13,825 | 15,743 | 41,014 | 49,103
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 124,685 | 80,024 | 345,484 | 376,495
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 462 | 374 | 1,507 | 1,609
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 15,416 | $ 9,411 | $ 48,937 | $ 36,712

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- Definition This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income. + References No definition available. + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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