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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
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.