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Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | $ 21,474,136 | $ 22,291,614
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | (176,270) | (243,177)
Cash and Cash Equivalents, Fair Value Disclosure | 371,345 | 575,864
Fair Value Measured On Recurring Basis Short Term Investments | 111,572 | 239,131
Other Assets, Fair Value Disclosure | 628,992 | 419,861
Total | 22,409,775 | 23,283,293
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 868,725 | 912,361
Total | 884,936 | 944,013
Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 769,513 | 533,349
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 371,345 | 575,864
Fair Value Measured On Recurring Basis Short Term Investments | 105,649 | 178,923
Other Assets, Fair Value Disclosure | 539,882 | 225,401
Total | 1,786,389 | 1,513,537
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 18,509,504 | 19,520,344
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Fair Value Measured On Recurring Basis Short Term Investments | 5,923 | 38,177
Other Assets, Fair Value Disclosure | 84,148 | 194,460
Total | 18,599,575 | 19,752,981
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Total | 16,211 | 31,652
Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 2,195,119 | 2,237,921
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | (176,270) | (243,177)
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Fair Value Measured On Recurring Basis Short Term Investments | 0 | 22,031
Other Assets, Fair Value Disclosure | 4,962 | 0
Total | 2,023,811 | 2,016,775
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 868,725 | 912,361
Total | 868,725 | 912,361
Nonredeemable Preferred Stock [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 81,854 | 74,841
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 74,220 | 64,268
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 2,672 | 10,573
Nonredeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 4,962 | 0
Equity Securities Other Than Non-redeemable Preferred Stock [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 323,877 | 147,859
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 323,877 | 147,859
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Securities Pledged as Collateral [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure |  | 17,002
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure |  | 1,323
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure |  | 15,679
Securities Pledged as Collateral [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure |  | 0
Other [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 9,142 | 11,951
Other [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 9,142 | 11,951
Other [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Interest Rate Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 9,904 | 104,972
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 3,828 | 196
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 9,904 | 104,972
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 3,828 | 196
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Foreign Exchange Forward [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 2,554 | 1,017
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 12,772 | 2,105
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 2,554 | 1,017
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 12,772 | 2,105
Foreign Exchange Forward [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Consumer Price Index Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | (309) | 1,446
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | (309) | 1,446
Consumer Price Index Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Credit Default Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 7,926 | (1,741)
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | (356) | 1,953
Credit Default Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Credit Default Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 7,926 | (1,741)
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | (356) | 1,953
Credit Default Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Equity Option [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 33,869 | 62,514
Equity Option [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Equity Option [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 33,869 | 62,514
Equity Option [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 | 0
Currency Swap [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 21,283 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | (33) | 27,398
Currency Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 21,283 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | (33) | 27,398
Currency Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Liabilities, Fair Value Disclosure | 0 | 0
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 138,892 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 132,643 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 6,249 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Other Assets, Fair Value Disclosure | 0 |
Corporate Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 12,110,755 | 12,380,071
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 68,934 | 43,544
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 10,696,532 | 10,667,964
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,345,289 | 1,668,563
Canadian Provincial Governments [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 3,381,025 | 4,049,334
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 3,381,025 | 4,049,334
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Residential Mortgage Backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 989,643 | 1,042,064
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 836,138 | 948,133
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 153,505 | 93,931
Asset-backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 894,832 | 691,555
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 422,984 | 459,164
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 471,848 | 232,391
Commercial Mortgage Backed Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,388,946 | 1,698,903
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,287,161 | 1,531,897
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 101,785 | 167,006
US Treasury and Government [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 501,351 | 265,190
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 396,092 | 192,780
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 64,340 | 67,872
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 40,919 | 4,538
US States and Political Subdivisions Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 320,820 | 302,498
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 277,044 | 259,286
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 43,776 | 43,212
Foreign Government Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,886,764 | 1,861,999
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 304,487 | 297,025
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | 1,544,280 | 1,536,694
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Fixed maturity securities available-for-sale | $ 37,997 | $ 28,280

X
- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. + References No definition available. + Details
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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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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 Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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- Definition Fair value portion of other assets. + References No definition available. + Details
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