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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | $ 4,617,617 |  | $ 4,843,277 |
Short-term investments | 977,778 |  | 1,044,779 |
Equity investments trading | 245,267 |  | 254,776 |
Other investments | 576,099 |  | 573,264 |
Total other assets and (liabilities) | 3,428 |  | (8,233) |
Total assets and liabilities measured on recurring basis | 6,420,189 |  | 6,707,863 |
U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,539,995 |  | 1,352,413 |
Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 134,461 |  | 186,050 |
Non-U.S. government (Sovereign Debt) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 298,080 |  | 334,580 |
Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 220,727 |  | 237,479 |
Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,495,481 |  | 1,803,415 |
Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 300,448 |  | 341,908 |
Non-agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 265,372 |  | 257,938 |
Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 344,590 |  | 314,236 |
Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 18,463 |  | 15,258 |
Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 325,711 |  | 322,391 |
Catastrophe Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 13,656 |  | 229,016 |
Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 233,321 |  | 18,048 |
Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 3,411 |  | 3,809 |
Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | 4,790 | [1] | 4,758 | [1]
Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | (1,362) |  | (12,991) |
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,539,995 |  | 1,352,413 |
Short-term investments | 0 |  | 0 |
Equity investments trading | 245,267 |  | 254,776 |
Other investments | 0 |  | 0 |
Total other assets and (liabilities) | 676 |  | 823 |
Total assets and liabilities measured on recurring basis | 1,785,938 |  | 1,608,012 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,539,995 |  | 1,352,413 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-U.S. government (Sovereign Debt) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Catastrophe Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | 676 | [1] | 823 | [1]
Quoted Prices In Active Markets For Identical Assets (Level 1) | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 3,040,484 |  | 3,463,284 |
Short-term investments | 977,778 |  | 1,044,779 |
Equity investments trading | 0 |  | 0 |
Other investments | 233,321 |  | 229,016 |
Total other assets and (liabilities) | 4,059 |  | (6,566) |
Total assets and liabilities measured on recurring basis | 4,255,642 |  | 4,730,513 |
Significant Other Observable Inputs (Level 2) | U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) | Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 134,461 |  | 186,050 |
Significant Other Observable Inputs (Level 2) | Non-U.S. government (Sovereign Debt) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 298,080 |  | 334,580 |
Significant Other Observable Inputs (Level 2) | Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 220,727 |  | 237,479 |
Significant Other Observable Inputs (Level 2) | Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,458,343 |  | 1,775,835 |
Significant Other Observable Inputs (Level 2) | Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 300,448 |  | 341,908 |
Significant Other Observable Inputs (Level 2) | Non-agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 265,372 |  | 257,938 |
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 344,590 |  | 314,236 |
Significant Other Observable Inputs (Level 2) | Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 18,463 |  | 15,258 |
Significant Other Observable Inputs (Level 2) | Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) | Catastrophe Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 229,016 |
Significant Other Observable Inputs (Level 2) | Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 233,321 |  | 0 |
Significant Other Observable Inputs (Level 2) | Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) | Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | 5,421 | [1] | 6,425 | [1]
Significant Other Observable Inputs (Level 2) | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | (1,362) |  | (12,991) |
Fair Value, Inputs, (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 37,138 |  | 27,580 |
Short-term investments | 0 |  | 0 |
Equity investments trading | 0 |  | 0 |
Other investments | 342,778 |  | 344,248 |
Total other assets and (liabilities) | (1,307) |  | (2,490) |
Total assets and liabilities measured on recurring basis | 378,609 |  | 369,338 |
Fair Value, Inputs, (Level 3) | U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Non-U.S. government (Sovereign Debt) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 37,138 |  | 27,580 |
Fair Value, Inputs, (Level 3) | Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Non-agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Fair Value, Inputs, (Level 3) | Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 325,711 |  | 322,391 |
Fair Value, Inputs, (Level 3) | Catastrophe Bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 13,656 |  | 0 |
Fair Value, Inputs, (Level 3) | Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 18,048 |
Fair Value, Inputs, (Level 3) | Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 3,411 |  | 3,809 |
Fair Value, Inputs, (Level 3) | Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | (1,307) | [1] | (2,490) | [1]
Fair Value, Inputs, (Level 3) | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total other assets and (liabilities) | $ 0 |  | $ 0 |
[1] | See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.

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