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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | $ 76,342 | $ 76,255
Held for investment | 66,571 | 60,840
Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 27,540,945 | 26,527,730
Available for sale, gross unrealized gains | 1,959,362 | 928,699
Available for sale, gross unrealized losses | (182,735) | (845,982)
Available for sale securities, fair value | 29,317,572 | 26,610,447
Equity Securities, Available For Sale [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 7,506 | 7,503
Available for sale, gross unrealized gains | 256 | 275
Available for sale, gross unrealized losses | 0 | 0
Available for sale securities, fair value | 7,762 | 7,778
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 | 38,590 | 44,852
Available for sale, gross unrealized gains | 310 | 367
Available for sale, gross unrealized losses | (417) | (2,294)
Available for sale securities, fair value | 38,483 | 42,925
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,199,787 | 1,313,776
Available for sale, gross unrealized gains | 21,181 | 1,875
Available for sale, gross unrealized losses | (35,627) | (121,362)
Available for sale securities, fair value | 1,185,341 | 1,194,289
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 | 3,188,026 | 3,181,032
Available for sale, gross unrealized gains | 324,759 | 164,785
Available for sale, gross unrealized losses | (6,587) | (39,074)
Available for sale securities, fair value | 3,506,198 | 3,306,743
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 181,120 | 86,112
Available for sale, gross unrealized gains | 13,335 | 8,907
Available for sale, gross unrealized losses | (1,492) | (3,462)
Available for sale securities, fair value | 192,963 | 91,557
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 17,916,567 | 17,142,118
Available for sale, gross unrealized gains | 1,371,622 | 606,948
Available for sale, gross unrealized losses | (100,814) | (516,029)
Available for sale securities, fair value | 19,187,375 | 17,233,037
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Held For Investment Securities [Member] |  |
Investment Holdings [Line Items] |  |
Held for investment, amortized cost | 76,342 | 76,255
Held for investment, gross unrealized gains | 0 | 0
Held for investment, gross unrealized losses | (9,771) | (15,415)
Held for investment | 66,571 | 60,840
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,747,233 | 1,895,913
Available for sale, gross unrealized gains | 137,213 | 119,230
Available for sale, gross unrealized losses | (13,881) | (43,183)
Available for sale securities, fair value | 1,870,565 | 1,971,960
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 2,249,396 | 1,821,988
Available for sale, gross unrealized gains | 56,897 | 3,287
Available for sale, gross unrealized losses | (10,197) | (89,815)
Available for sale securities, fair value | 2,296,096 | 1,735,460
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member] | Available For Sale Securities [Member] |  |
Investment Holdings [Line Items] |  |
Available for sale, amortized cost | 1,020,226 | 1,041,939
Available for sale, gross unrealized gains | 34,045 | 23,300
Available for sale, gross unrealized losses | (13,720) | (30,763)
Available for sale securities, fair value | $ 1,040,551 | $ 1,034,476

X
- 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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