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Investments (Schedule of Amortized Cost and Fair Value of Fixed Maturity and Equity Securities) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,212 | $ 76,088
Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 25,783,116 | 21,957,027
Available for sale, gross unrealized gains | 1,121,104 | 2,283,010
Available for sale, gross unrealized losses | (641,342) | (67,901)
Available for sale securities, fair value | 26,262,878 | 24,172,136
Equity Securities, Available For Sale [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 8,917 | 44,598
Available for sale, gross unrealized gains | 791 | 10,227
Available for sale, gross unrealized losses | 0 | (1,403)
Available for sale securities, fair value | 9,708 | 53,422
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 4,608 | 4,590
Available for sale, gross unrealized gains | 342 | 564
Available for sale, gross unrealized losses | (43) | 0
Available for sale securities, fair value | 4,907 | 5,154
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,314,449 | 1,763,789
Available for sale, gross unrealized gains | 4,069 | 11,704
Available for sale, gross unrealized losses | (78,915) | (3,468)
Available for sale securities, fair value | 1,239,603 | 1,772,025
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 3,278,749 | 3,116,678
Available for sale, gross unrealized gains | 212,975 | 461,770
Available for sale, gross unrealized losses | (30,593) | (125)
Available for sale securities, fair value | 3,461,131 | 3,578,323
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 86,109 | 86,099
Available for sale, gross unrealized gains | 9,365 | 19,160
Available for sale, gross unrealized losses | (2,792) | 0
Available for sale securities, fair value | 92,682 | 105,259
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 16,420,869 | 12,930,173
Available for sale, gross unrealized gains | 720,010 | 1,568,223
Available for sale, gross unrealized losses | (399,298) | (31,624)
Available for sale securities, fair value | 16,741,581 | 14,466,772
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,212 | 76,088
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (15,369) | (14,567)
Held for investment, fair value | 60,843 | 61,521
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,999,201 | 2,743,537
Available for sale, gross unrealized gains | 145,605 | 172,304
Available for sale, gross unrealized losses | (25,979) | (27,728)
Available for sale securities, fair value | 2,118,827 | 2,888,113
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,664,541 | 354,870
Available for sale, gross unrealized gains | 5,194 | 5,095
Available for sale, gross unrealized losses | (79,425) | (1,983)
Available for sale securities, fair value | 1,590,310 | 357,982
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,014,590 | 957,291
Available for sale, gross unrealized gains | 23,544 | 44,190
Available for sale, gross unrealized losses | (24,297) | (2,973)
Available for sale securities, fair value | $ 1,013,837 | $ 998,508

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7-11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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