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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 21,284,216 | $ 22,291,614
Funds withheld at interest embedded derivatives | (108,473) | (243,177)
Cash and cash equivalents | 347,823 | 575,864
Short-term investments | 21,092 | 239,131
Other invested assets | 293,889 | 419,861
Total Assets | 21,838,547 | 23,283,293
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 878,568 | 912,361
Total Liabilities | 891,687 | 944,013
Non-redeemable preferred stock |  |
Assets Fair Value Disclosure |  |
Other invested assets | 90,458 | 74,841
Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 69,881 | 147,859
Securities Pledged As Collateral Member |  |
Assets Fair Value Disclosure |  |
Other invested assets |  | 17,002
Other |  |
Assets Fair Value Disclosure |  |
Other invested assets | 14,759 | 11,951
Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 36,853 | 104,972
Liabilities Fair Value Disclosure |  |
Other liabilities | 4,140 | 196
Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 8,073 |
Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Other invested assets | 148 | 1,017
Liabilities Fair Value Disclosure |  |
Other liabilities | 9,484 | 2,105
Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 60,715 | 62,514
Liabilities Fair Value Disclosure |  |
Other liabilities | (387) |
Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (23) | 1,446
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (2,775) | (1,741)
Liabilities Fair Value Disclosure |  |
Other liabilities | (118) | 1,953
Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 15,800 |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 27,398
Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 11,803,481 | 12,380,071
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,525,793 | 4,049,334
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,054,968 | 1,042,064
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 790,310 | 691,555
Commercial mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,638,632 | 1,698,903
US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 412,990 | 265,190
State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 291,811 | 302,498
Other foreign government, supranational and foreign government-sponsored enterprises |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,766,231 | 1,861,999
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 708,373 | 533,349
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 347,823 | 575,864
Short-term investments | 19,169 | 178,923
Other invested assets | 172,368 | 225,401
Total Assets | 1,247,733 | 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 | Non-redeemable preferred stock |  |
Assets Fair Value Disclosure |  |
Other invested assets | 87,728 | 64,268
Fair Value Inputs Level 1 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Other invested assets | 69,881 | 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 | 14,759 | 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
Fair Value Inputs Level 1 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 63,568 | 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 |  |
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 | 354,097 | 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 | 290,708 | 297,025
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 18,242,091 | 19,520,344
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 0 | 0
Short-term investments | 1,923 | 38,177
Other invested assets | 121,521 | 194,460
Total Assets | 18,365,535 | 19,752,981
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 0 | 0
Total Liabilities | 13,119 | 31,652
Fair Value Inputs Level 2 Member | Non-redeemable preferred stock |  |
Assets Fair Value Disclosure |  |
Other invested assets | 2,730 | 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 | 36,853 | 104,972
Liabilities Fair Value Disclosure |  |
Other liabilities | 4,140 | 196
Fair Value Inputs Level 2 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Other invested assets | 8,073 |
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Other invested assets | 148 | 1,017
Liabilities Fair Value Disclosure |  |
Other liabilities | 9,484 | 2,105
Fair Value Inputs Level 2 Member | Equity Option |  |
Assets Fair Value Disclosure |  |
Other invested assets | 60,715 | 62,514
Liabilities Fair Value Disclosure |  |
Other liabilities | (387) |
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (23) | 1,446
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | (2,775) | (1,741)
Liabilities Fair Value Disclosure |  |
Other liabilities | (118) | 1,953
Fair Value Inputs Level 2 Member | Foreign Currency Swaps |  |
Assets Fair Value Disclosure |  |
Other invested assets | 15,800 |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 27,398
Fair Value Inputs Level 2 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 10,147,908 | 10,667,964
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,525,793 | 4,049,334
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 914,914 | 948,133
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 437,704 | 459,164
Fair Value Inputs Level 2 Member | Commercial mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,457,650 | 1,531,897
Fair Value Inputs Level 2 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 58,893 | 67,872
Fair Value Inputs Level 2 Member | State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 250,536 | 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 | 1,448,693 | 1,536,694
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,333,752 | 2,237,921
Funds withheld at interest embedded derivatives | (108,473) | (243,177)
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 22,031
Other invested assets | 0 | 0
Total Assets | 2,225,279 | 2,016,775
Liabilities Fair Value Disclosure |  |
Interest-sensitive contract liabilities - embedded derivatives | 878,568 | 912,361
Total Liabilities | 878,568 | 912,361
Fair Value Inputs Level 3 Member | Non-redeemable preferred stock |  |
Assets Fair Value Disclosure |  |
Other invested assets | 0 | 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
Fair Value Inputs Level 3 Member | Corporate securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,592,005 | 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 | 140,054 | 93,931
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 352,606 | 232,391
Fair Value Inputs Level 3 Member | Commercial mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 180,982 | 167,006
Fair Value Inputs Level 3 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 4,538
Fair Value Inputs Level 3 Member | State and political subdivisions |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 41,275 | 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 | $ 26,830 | $ 28,280

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