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Investments (Schedule of Fixed Maturity and Equity Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,255 | $ 76,088
Held for investment, fair value | 60,840 | 61,521
Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 26,527,730 | 21,957,027
Available for sale securities, gross unrealized gains | 928,699 | 2,283,010
Available for sale securities, gross unrealized losses | (845,982) | (67,901)
Available for sale securities, fair value | 26,610,447 | 24,172,136
Equity Securities, Available For Sale [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 7,503 | 44,598
Available for sale securities, gross unrealized gains | 275 | 10,227
Available for sale securities, gross unrealized losses | 0 | (1,403)
Available for sale securities, fair value | 7,778 | 53,422
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 44,852 | 4,590
Available for sale securities, gross unrealized gains | 367 | 564
Available for sale securities, gross unrealized losses | (2,294) | 0
Available for sale securities, fair value | 42,925 | 5,154
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,313,776 | 1,763,789
Available for sale securities, gross unrealized gains | 1,875 | 11,704
Available for sale securities, gross unrealized losses | (121,362) | (3,468)
Available for sale securities, fair value | 1,194,289 | 1,772,025
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 3,181,032 | 3,116,678
Available for sale securities, gross unrealized gains | 164,785 | 461,770
Available for sale securities, gross unrealized losses | (39,074) | (125)
Available for sale securities, fair value | 3,306,743 | 3,578,323
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 86,112 | 86,099
Available for sale securities, gross unrealized gains | 8,907 | 19,160
Available for sale securities, gross unrealized losses | (3,462) | 0
Available for sale securities, fair value | 91,557 | 105,259
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 17,142,118 | 12,930,173
Available for sale securities, gross unrealized gains | 606,948 | 1,568,223
Available for sale securities, gross unrealized losses | (516,029) | (31,624)
Available for sale securities, fair value | 17,233,037 | 14,466,772
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,255 | 76,088
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (15,415) | (14,567)
Held for investment, fair value | 60,840 | 61,521
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,895,913 | 2,743,537
Available for sale securities, gross unrealized gains | 119,230 | 172,304
Available for sale securities, gross unrealized losses | (43,183) | (27,728)
Available for sale securities, fair value | 1,971,960 | 2,888,113
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,821,988 | 354,870
Available for sale securities, gross unrealized gains | 3,287 | 5,095
Available for sale securities, gross unrealized losses | (89,815) | (1,983)
Available for sale securities, fair value | 1,735,460 | 357,982
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale securities, amortized cost | 1,041,939 | 957,291
Available for sale securities, gross unrealized gains | 23,300 | 44,190
Available for sale securities, gross unrealized losses | (30,763) | (2,973)
Available for sale securities, fair value | $ 1,034,476 | $ 998,508

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- Definition Amount of investment in debt and equity 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 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: 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 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 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 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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