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Investments (Investment Income Net of Related Expenses) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | $ 1,751,891 | $ 1,475,396 | $ 1,311,289
Investment Income, Investment Expense | (52,026) | (39,190) | (30,092)
Investment income, net of related expenses | 1,699,865 | 1,436,206 | 1,281,197
Available-for-sale Securities [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 966,759 | 868,682 | 757,726
Mortgage Loans on Real Estate [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 121,476 | 96,901 | 55,931
Policy Loans [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 57,099 | 62,855 | 66,621
Funds Withheld At Interest [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 545,550 | 393,586 | 388,694
Short-term Investments [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | 2,236 | 4,173 | 2,378
Other Aggregated Investments [Member] |  |  |
Major Categories Of Investment Income Net Of Expenses [Line Items] |  |  |
Gross Investment Income, Operating | $ 58,771 | $ 49,199 | $ 39,939

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- Definition Amount, before 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + 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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