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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 | Jun. 30, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | $ 4,870,828 |  | $ 4,843,277 |
Short term investments | 957,698 |  | 1,044,779 |
Equity investments trading | 254,408 |  | 254,776 |
Other investments | 513,614 |  | 573,264 |
Other assets and (liabilities) | 1,277 |  | (8,233) |
Total assets and liabilities measured on recurring basis | 6,597,825 |  | 6,707,863 |
U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,706,929 |  | 1,352,413 |
Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 121,650 |  | 186,050 |
Non-U.S. government (Sovereign Debt) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 271,495 |  | 334,580 |
Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 163,911 |  | 237,479 |
Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 1,580,038 |  | 1,803,415 |
Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 326,304 |  | 341,908 |
Non-agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 265,340 |  | 257,938 |
Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 400,288 |  | 314,236 |
Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 34,873 |  | 15,258 |
Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 314,983 |  | 322,391 |
Catastrophe bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 179,465 |  | 229,016 |
Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 15,976 |  | 18,048 |
Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 3,190 |  | 3,809 |
Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other assets and (liabilities) | 6,491 | [1] | 4,758 | [1]
Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other assets and (liabilities) | (5,214) |  | (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 | 1,706,929 |  | 1,352,413 |
Short term investments | 0 |  | 0 |
Equity investments trading | 254,408 |  | 254,776 |
Other investments | 0 |  | 0 |
Other assets and (liabilities) | (340) |  | 823 |
Total assets and liabilities measured on recurring basis | 1,960,997 |  | 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 | 1,706,929 |  | 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] |  |  |  |
Other assets and (liabilities) | (340) | [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] |  |  |  |
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 | 3,117,723 |  | 3,463,284 |
Short term investments | 957,698 |  | 1,044,779 |
Equity investments trading | 0 |  | 0 |
Other investments | 179,465 |  | 229,016 |
Other assets and (liabilities) | 546 |  | (6,566) |
Total assets and liabilities measured on recurring basis | 4,255,432 |  | 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 | 121,650 |  | 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 | 271,495 |  | 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 | 163,911 |  | 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 | 1,533,862 |  | 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 | 326,304 |  | 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 | 265,340 |  | 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 | 400,288 |  | 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 | 34,873 |  | 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 | 179,465 |  | 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 | 0 |  | 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] |  |  |  |
Other assets and (liabilities) | 5,760 | [1] | 6,425 | [1]
Significant Other Observable Inputs (Level 2) | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other assets and (liabilities) | (5,214) |  | (12,991) |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 46,176 |  | 27,580 |
Short term investments | 0 |  | 0 |
Equity investments trading | 0 |  | 0 |
Other investments | 334,149 |  | 344,248 |
Other assets and (liabilities) | 1,071 |  | (2,490) |
Total assets and liabilities measured on recurring basis | 381,396 |  | 369,338 |
Significant Unobservable Inputs (Level 3) | U.S. treasuries |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) | Agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Unobservable 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 |
Significant Unobservable 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 |
Significant Unobservable Inputs (Level 3) | Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 46,176 |  | 27,580 |
Significant Unobservable Inputs (Level 3) | Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Unobservable 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 |
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) | Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fixed maturity investments | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) | Private equity partnerships |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 314,983 |  | 322,391 |
Significant Unobservable Inputs (Level 3) | Catastrophe bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 15,976 |  | 18,048 |
Significant Unobservable Inputs (Level 3) | Hedge funds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 3,190 |  | 3,809 |
Significant Unobservable Inputs (Level 3) | Derivatives |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other assets and (liabilities) | 1,071 | [1] | (2,490) | [1]
Significant Unobservable Inputs (Level 3) | Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
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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