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Fair Value of Assets and Liabilities 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 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 24,475,451 | $ 21,474,136
Funds withheld at interest embedded derivatives | 36,617 | (176,270)
Cash and cash equivalents | 425,636 | 371,345
Short-term investments | 16,219 | 111,572
Other invested assets | 477,220 | 628,992
Other Assets, Fair Value Disclosure | 4,407 |
Total Assets | 25,435,550 | 22,409,775
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 1,017,927 | 868,725
Total Liabilities | 1,036,403 | 884,936
Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 87,589 | 81,854
Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 74,361 | 323,877
Securities Pledged as Collateral [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 21,283
Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 9,591 | 9,142
Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 56,092 | 9,904
Liabilities Fair Value Disclosure |  |
Other liabilities | 7,595 | 3,828
Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 6,705 | 2,554
Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 10,408 | 12,772
Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 40,966 | 33,869
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (33)
Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 52,236 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 142,125 | 138,892
Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (101) | (309)
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 7,656 | 7,926
Liabilities Fair Value Disclosure |  |
Other liabilities | 153 | (356)
Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 320 |
Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 14,190,456 | 12,110,755
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,714,338 | 3,381,025
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,000,717 | 989,643
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,006,048 | 894,832
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,481,822 | 1,388,946
US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 479,986 | 501,351
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 410,064 | 320,820
Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,192,020 | 1,886,764
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 784,891 | 769,513
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 425,636 | 371,345
Short-term investments | 8,414 | 105,649
Other invested assets | 307,991 | 539,882
Other Assets, Fair Value Disclosure | 0 |
Total Assets | 1,526,932 | 1,786,389
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total Liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 87,589 | 74,220
Fair Value Inputs Level 1 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 74,361 | 323,877
Fair Value Inputs Level 1 Member | Securities Pledged as Collateral [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 0
Fair Value Inputs Level 1 Member | Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 9,591 | 9,142
Fair Value Inputs Level 1 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 0
Fair Value Inputs Level 1 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Fair Value Inputs Level 1 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 |
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 136,450 | 132,643
Fair Value Inputs Level 1 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 1 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 115,707 | 68,934
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 389,358 | 396,092
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 279,826 | 304,487
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 21,402,498 | 18,509,504
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 0 | 0
Short-term investments | 7,805 | 5,923
Other invested assets | 169,229 | 84,148
Other Assets, Fair Value Disclosure | 0 |
Total Assets | 21,579,532 | 18,599,575
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total Liabilities | 18,156 | 16,211
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 2,672
Fair Value Inputs Level 2 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 2 Member | Securities Pledged as Collateral [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 21,283
Fair Value Inputs Level 2 Member | Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 2 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 56,092 | 9,904
Liabilities Fair Value Disclosure |  |
Other liabilities | 7,595 | 3,828
Fair Value Inputs Level 2 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 6,705 | 2,554
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 10,408 | 12,772
Fair Value Inputs Level 2 Member | Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 40,966 | 33,869
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (33)
Fair Value Inputs Level 2 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 52,236 |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 5,675 | 6,249
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (101) | (309)
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 7,656 | 7,926
Liabilities Fair Value Disclosure |  |
Other liabilities | 153 | (356)
Fair Value Inputs Level 2 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 12,697,745 | 10,696,532
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,714,338 | 3,381,025
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 813,215 | 836,138
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 461,416 | 422,984
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,386,303 | 1,287,161
Fair Value Inputs Level 2 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 60,240 | 64,340
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 367,559 | 277,044
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,901,682 | 1,544,280
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,288,062 | 2,195,119
Funds withheld at interest embedded derivatives | 36,617 | (176,270)
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Other invested assets | 0 | 4,962
Other Assets, Fair Value Disclosure | 4,407 |
Total Assets | 2,329,086 | 2,023,811
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 1,017,927 | 868,725
Total Liabilities | 1,018,247 | 868,725
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 4,962
Fair Value Inputs Level 3 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 3 Member | Securities Pledged as Collateral [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 0
Fair Value Inputs Level 3 Member | Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 3 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 3 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Fair Value Inputs Level 3 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 |
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 3 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Fair Value Inputs Level 3 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 320 |
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,377,004 | 1,345,289
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 187,502 | 153,505
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 544,632 | 471,848
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 95,519 | 101,785
Fair Value Inputs Level 3 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 30,388 | 40,919
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 42,505 | 43,776
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 10,512 | $ 37,997

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 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 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 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 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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