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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
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.