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Comprehensive Income (Components of Net Unrealized Appreciation Depreciation of Balances Carried at Fair Value) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |  |
Fixed maturity securities available-for-sale | $ 21,474,136 |  | $ 22,291,614 |  |  |
Other invested assets | 1,324,960 |  | 1,159,543 |  |  |
Deferred policy acquisition costs | 3,517,796 |  | 3,619,274 |  |  |
Accumulated Other Comprehensive Income Loss Change In Component During Period | (1,524,866) |  | 705,021 |  | 1,043,844 |
Change In Net Unrealized Appreciation Depreciation [Member] |  |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |  |
Fixed maturity securities available-for-sale | (1,528,773) |  | 713,778 |  | 1,058,505 |
Other invested assets | (12,274) | [1] | 6,181 | [1] | (7,213) | [1]
Effect On Unrealized Appreciation Depreciation [Member] |  |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |  |
Deferred policy acquisition costs | $ 16,181 |  | $ (14,938) |  | $ (7,448) |
[1] | Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + 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 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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