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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, 2013 | Dec. 31, 2012
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 21,289,108 | $ 22,291,614
Funds withheld at interest embedded derivatives | (175,933) | (243,177)
Cash and cash equivalents | 671,999 | 575,864
Short-term investments | 19,436 | 239,131
Other invested assets | 249,845 | 419,861
Total Assets | 22,054,455 | 23,283,293
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 825,899 | 912,361
Total Liabilities | 839,047 | 944,013
Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 82,839 | 74,841
Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 64,071 | 147,859
Securities Pledged As Collateral Member |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 17,002
Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 15,514 | 11,951
Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 29,102 | 104,972
Liabilities Fair Value Disclosure |  |
Other liabilities | 2,286 | 196
Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 5,699 |
Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 1,017
Liabilities Fair Value Disclosure |  |
Other liabilities | 8,928 | 2,105
Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 43,482 | 62,514
Liabilities Fair Value Disclosure |  |
Other liabilities | (139) |
Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 112 | 1,446
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 1,764 | (1,741)
Liabilities Fair Value Disclosure |  |
Other liabilities | (170) | 1,953
Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 7,262 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 2,243 | 27,398
Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 11,934,562 | 12,380,071
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,491,156 | 4,049,334
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 951,838 | 1,042,064
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 885,278 | 691,555
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,453,114 | 1,698,903
US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 430,847 | 265,190
State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 297,729 | 302,498
Other foreign government, supranational and foreign government-sponsored enterprises |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,844,584 | 1,861,999
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 723,377 | 533,349
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 671,999 | 575,864
Short-term investments | 12,761 | 178,923
Other invested assets | 154,864 | 225,401
Total Assets | 1,563,001 | 1,513,537
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 | 75,279 | 64,268
Fair Value Inputs Level 1 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 64,071 | 147,859
Fair Value Inputs Level 1 Member | Securities Pledged As Collateral Member |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 1,323
Fair Value Inputs Level 1 Member | Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 15,514 | 11,951
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 |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
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 | 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 | Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 58,111 | 43,544
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 | 362,269 | 192,780
Fair Value Inputs Level 1 Member | State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Other foreign government, supranational and foreign government-sponsored enterprises |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 302,997 | 297,025
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 18,284,520 | 19,520,344
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 0 | 0
Short-term investments | 6,675 | 38,177
Other invested assets | 90,156 | 194,460
Total Assets | 18,381,351 | 19,752,981
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total Liabilities | 13,148 | 31,652
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 2,735 | 10,573
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 |  | 15,679
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 | 29,102 | 104,972
Liabilities Fair Value Disclosure |  |
Other liabilities | 2,286 | 196
Fair Value Inputs Level 2 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 5,699 |
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 1,017
Liabilities Fair Value Disclosure |  |
Other liabilities | 8,928 | 2,105
Fair Value Inputs Level 2 Member | Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 43,482 | 62,514
Liabilities Fair Value Disclosure |  |
Other liabilities | (139) |
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 112 | 1,446
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 1,764 | (1,741)
Liabilities Fair Value Disclosure |  |
Other liabilities | (170) | 1,953
Fair Value Inputs Level 2 Member | Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 7,262 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 2,243 | 27,398
Fair Value Inputs Level 2 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 10,356,155 | 10,667,964
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,491,156 | 4,049,334
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 818,567 | 948,133
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 457,198 | 459,164
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,328,173 | 1,531,897
Fair Value Inputs Level 2 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 65,156 | 67,872
Fair Value Inputs Level 2 Member | State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 253,688 | 259,286
Fair Value Inputs Level 2 Member | Other foreign government, supranational and foreign government-sponsored enterprises |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,514,427 | 1,536,694
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,281,211 | 2,237,921
Funds withheld at interest embedded derivatives | (175,933) | (243,177)
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 22,031
Other invested assets | 4,825 | 0
Total Assets | 2,110,103 | 2,016,775
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 825,899 | 912,361
Total Liabilities | 825,899 | 912,361
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Other invested assets | 4,825 | 0
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 |
Fair Value Inputs Level 3 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 0
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 | 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 | Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,520,296 | 1,668,563
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 | 133,271 | 93,931
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 428,080 | 232,391
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 124,941 | 167,006
Fair Value Inputs Level 3 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,422 | 4,538
Fair Value Inputs Level 3 Member | State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 44,041 | 43,212
Fair Value Inputs Level 3 Member | Other foreign government, supranational and foreign government-sponsored enterprises |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 27,160 | $ 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 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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