v2.3.0.15

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Total fixed maturity investments | $ 3,837,638 | $ 4,116,697
Short-term investments | 1,557,937 | 1,110,364
Equity investments trading | 45,607 |
Other investments | 736,757 | 787,548
Other secured assets |  | 14,250
Total other assets and (liabilities) | 20,513 | 63,019
Total assets and liabilities measured on recurring basis | 6,198,452 | 6,091,878
U.S. Treasuries [Member] |  |
Total fixed maturity investments | 428,865 | 761,461
U.S. Treasuries [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Total fixed maturity investments | 428,865 | 761,461
Agencies [Member] |  |
Total fixed maturity investments | 127,063 | 216,963
Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 127,063 | 216,963
Non-U.S. Government (Sovereign Debt) [Member] |  |
Total fixed maturity investments | 402,288 | 184,387
Non-U.S. Government (Sovereign Debt) [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 402,288 | 184,387
FDIC Guaranteed Corporate [Member] |  |
Total fixed maturity investments | 183,314 | 388,468
FDIC Guaranteed Corporate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 183,314 | 388,468
Non-U.S. Government-Backed Corporate [Member] |  |
Total fixed maturity investments | 594,897 | 357,504
Non-U.S. Government-Backed Corporate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 594,897 | 357,504
Corporate [Member] |  |
Total fixed maturity investments | 1,294,442 | 1,512,411
Corporate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 1,273,528 | 1,490,626
Corporate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Total fixed maturity investments | 20,914 | 21,785
Agency Mortgage-Backed [Member] |  |
Total fixed maturity investments | 363,814 | 401,807
Agency Mortgage-Backed [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 363,814 | 401,807
Non-Agency Mortgage-Backed [Member] |  |
Total fixed maturity investments | 104,541 | 34,149
Non-Agency Mortgage-Backed [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 104,541 | 34,149
Commercial Mortgage-Backed [Member] |  |
Total fixed maturity investments | 318,805 | 219,440
Commercial Mortgage-Backed [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 318,805 | 219,440
Asset-Backed [Member] |  |
Total fixed maturity investments | 19,609 | 40,107
Asset-Backed [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 19,609 | 40,107
Private Equity Funds [Member] |  |
Other investments | 345,986 | 347,556
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Other investments | 345,986 | 347,556
Senior Secured Bank Loan Funds [Member] |  |
Other investments | 243,766 | 166,106
Senior Secured Bank Loan Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Other investments | 231,251 | 158,386
Senior Secured Bank Loan Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Other investments | 12,515 | 7,720
Catastrophe Bonds [Member] |  |
Other investments | 85,800 | 123,961
Catastrophe Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Other investments | 85,619 | 123,961
Catastrophe Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Other investments | 181 |
Non-U.S. Fixed Income Funds [Member] |  |
Other investments | 29,440 | 80,224
Non-U.S. Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Other investments | 29,440 | 80,224
Hedge Funds [Member] |  |
Other investments | 26,810 | 41,005
Hedge Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Other investments | 26,810 | 41,005
Miscellaneous Investments [Member] |  |
Other investments | 4,955 | 28,696
Miscellaneous Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Other investments |  | 21,870
Miscellaneous Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Other investments | 4,955 | 6,826
Platinum Warrants [Member] |  |
Total other assets and (liabilities) |  | 44,925
Platinum Warrants [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total other assets and (liabilities) |  | 44,925
Assumed And Ceded (Re)Insurance Contracts [Member] |  |
Total other assets and (liabilities) | 4,418 | 1,772
Assumed And Ceded (Re)Insurance Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Total other assets and (liabilities) | 4,418 | 1,772
Derivatives Assets [Member] |  |
Total other assets and (liabilities) | 2,720 | 2,693
Derivatives Assets [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Total other assets and (liabilities) | (773) | (51)
Derivatives Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Total other assets and (liabilities) | 950 | 6,245
Derivatives Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Total other assets and (liabilities) | 2,543 | (3,501)
Other [Member] |  |
Total other assets and (liabilities) | 13,375 | 13,629
Other [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Total other assets and (liabilities) | (4,241) | (4,599)
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Total other assets and (liabilities) | 17,616 | 18,228
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Total fixed maturity investments | 428,865 | 761,461
Equity investments trading | 45,607 |
Total other assets and (liabilities) | (5,014) | (4,650)
Total assets and liabilities measured on recurring basis | 469,458 | 756,811
Significant Other Observable Inputs (Level 2) [Member] |  |
Total fixed maturity investments | 3,387,859 | 3,333,451
Short-term investments | 1,557,937 | 1,110,364
Other investments | 373,120 | 425,446
Other secured assets |  | 14,250
Total other assets and (liabilities) | 950 | 51,170
Total assets and liabilities measured on recurring basis | 5,319,866 | 4,934,681
Significant Unobservable Inputs (Level 3) [Member] |  |
Total fixed maturity investments | 20,914 | 21,785
Other investments | 363,637 | 362,102
Total other assets and (liabilities) | 24,577 | 16,499
Total assets and liabilities measured on recurring basis | $ 409,128 | $ 400,386

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