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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Disclosures Abstract  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  Quoted Prices Significant Significant    
   in Active Other Other Collateral   
  Markets for Observable  Unobservable  and Balance at
December 31, 2012 Identical Assets Inputs Inputs Counterparty December 31,
(U.S. dollars in thousands) (Level 1) (Level 2) (Level 3) Netting 2012
Assets               
U.S. Government and Government - Related/Supported $- $2,034,617 $- $- $2,034,617
Corporate (1) (2)  -  10,451,902  30,098  -  10,482,000
Residential mortgage-backed securities – Agency ("RMBS - Agency")   -  5,223,488  32,005  -  5,255,493
Residential mortgage-backed securities – Non-Agency ("RMBS - Non-Agency")  -  647,617  116  -  647,733
Commercial mortgage-backed securities ("CMBS")  -  1,051,904  25,347  -  1,077,251
Collateralized debt obligations ("CDO")  -  8,080  701,736  -  709,816
Other asset-backed securities (2)  -  1,452,583  18,128  -  1,470,711
U.S. States and political subdivisions of the States  -  1,911,017  -  -  1,911,017
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported  -  4,258,282  -  -  4,258,282
Total fixed maturities, at fair value $- $27,039,490 $807,430 $- $27,846,920
Equity securities, at fair value (3)  253,957  395,402  -  -  649,359
Short-term investments, at fair value (4)  -  322,703  -  -  322,703
Total investments available for sale $253,957 $27,757,595 $807,430 $- $28,818,982
Cash equivalents (5)  1,596,376  408,292  -  -  2,004,668
Other investments (6)  -  792,483  115,272  -  907,755
Other assets (7)  -  17,837  -  12,130  29,967
Total assets accounted for at fair value $1,850,333 $28,976,207 $922,702 $12,130 $31,761,372
                
Liabilities               
Financial instruments sold, but not yet purchased (8) $- $26,235 $- $- $26,235
Other liabilities (7)  -  23,376  36,247  -  59,623
Total liabilities accounted for at fair value $- $49,611 $36,247 $- $85,858

  Quoted Prices Significant Significant    
   in Active Other Other Collateral   
  Markets for Observable  Unobservable  and Balance at
December 31, 2011 Identical Assets Inputs Inputs Counterparty December 31,
(U.S. dollars in thousands) (Level 1) (Level 2) (Level 3) Netting 2011
Assets               
U.S. Government and Government - Related/Supported $- $1,990,983 $- $- $1,990,983
Corporate (1) (2)  -  10,084,804  23,818  -  10,108,622
RMBS – Agency  -  5,347,365  32,041  -  5,379,406
RMBS – Non-Agency  -  641,815  -  -  641,815
CMBS  -  974,835  -  -  974,835
CDO  -  7,751  650,851  -  658,602
Other asset-backed securities (2)  -  1,323,697  16,552  -  1,340,249
U.S. States and political subdivisions of the States  -  1,797,378  -  -  1,797,378
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported  -  3,298,135  -  -  3,298,135
Total fixed maturities, at fair value (2) $- $25,466,763 $723,262 $- $26,190,025
Equity securities, at fair value (3)  239,175  229,022  -  -  468,197
Short-term investments, at fair value (4)  -  359,063  -  -  359,063
Total investments available for sale $239,175 $26,054,848 $723,262 $- $27,017,285
Cash equivalents (5)  1,686,101  1,068,264  -  -  2,754,365
Other investments (6)  -  547,598  113,959  -  661,557
Other assets (7)  -  143,622  -  (77,888)  65,734
Total assets accounted for at fair value $1,925,276 $27,814,332 $837,221 $(77,888) $30,498,941
                
Liabilities               
Financial instruments sold, but not yet purchased (8) $- $20,844 $- $- $20,844
Other liabilities (7)  -  16,871  42,644  (809)  58,706
Total liabilities accounted for at fair value $- $37,715 $42,644 $(809) $79,550

_______________

(1)       Included within Corporate are certain medium term notes supported primarily by pools of European investment grade credit with varying degrees of leverage. The notes, which are in a gross unrealized loss position, had a fair value of $194.3 million and $266.0 million and an amortized cost of $194.8 million and $297.7 million at December 31, 2012 and December 31, 2011, respectively. These notes allow the investor to participate in cash flows of the underlying bonds including certain residual values, which could serve to either decrease or increase the ultimate values of these notes.

(2)       The Company invests in covered bonds issued by financial institutions (“Covered Bonds”). Covered Bonds are senior secured debt instruments issued by financial institutions and backed by over-collateralized pools of public sector or mortgage loans. At December 31, 2012, Covered Bonds within Total fixed maturities with a fair value of $647.1 million are included within Other asset-backed securities to align the Company's classification to market indices. At December 31, 2011, Covered Bonds within Total fixed maturities with a fair value of $353.9 million were reclassified from Corporate to Other asset-backed securities to conform to current period presentation.

(3)       Included within Equity securities are investments in fixed income funds with a fair value of $101.9 million and $91.6 million at December 31, 2012 and December 31, 2011, respectively.

(4)       Short-term investments consist primarily of Corporate securities and U.S. and Non-U.S. Government and Government-Related/Supported securities.

(5)       Cash equivalents balances subject to fair value measurement include certificates of deposit and money market funds. Operating cash balances are not subject to fair value measurement guidance.

(6)       The Other investments balance excludes certain structured transactions including certain investments in project finance transactions, a payment obligation and liquidity financing provided to a structured credit vehicle as a part of a third party medium term note facility. These investments, which totaled $312.1 million at December 31, 2012 and $323.7 million at December 31, 2011, are carried at amortized cost. For further details regarding the nature of Other investments and related features see Note 7, “Other Investments,” to the Consolidated Financial Statements.

(7)       Other assets and other liabilities include derivative instruments. The derivative balances included in each category are reported on a gross basis by level with a netting adjustment presented separately in the Collateral and Counterparty Netting column. The Company often enters into different types of derivative contracts with a single counterparty and these contracts are covered under a netting agreement. In addition, at December 31, 2012 the Company paid net cash collateral related to these derivative positions of $12.1 million. The assets related to the net collateral paid were recorded as Other assets within the balance sheet. At December 31, 2011, the Company held net cash collateral of $77.1 million. The collateral balance was included within Cash and cash equivalents and the corresponding liability to return the collateral has been offset against the derivative asset within the balance sheet as appropriate under the netting agreement. The fair values of the individual derivative contracts are reported gross in their respective levels based on the fair value hierarchy.

(8)       Financial instruments sold, but not yet purchased, represent “short sales” and are included within “Payable for investments purchased” on the balance sheet.

 
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Text Block]
                
 Level 3 Assets and Liabilities - Year Ended December 31, 2012
(U.S. dollars in thousands)  Corporate  RMBS - Agency  RMBS - Non Agency  CMBS  CDO
Balance, beginning of period $23,818 $32,041 $- $- $650,851
Realized gains (losses)  4  (15)  -  -  (894)
Movement in unrealized gains (losses)  100  27  -  20  109,282
Purchases and issuances  10,278  -  -  25,546  -
Sales and settlements  (282)  (6,307)  -  (219)  (57,032)
Transfers into Level 3  819  21,249  116  -  -
Transfers out of Level 3  (4,639)  (14,990)  -  -  (471)
Balance, end of period $30,098 $32,005 $116 $25,347 $701,736
Movement in total gains (losses) above relating to instruments still held at the reporting date $122 $10 $- $20 $104,474
                
                
 Level 3 Assets and Liabilities - Year Ended December 31, 2012
(U.S. dollars in thousands)  Other asset-backed securities  Non-US Sovereign Government, Provincial, Supranational and Government Related/Supported  Short-term investments  Other investments  Derivative Contracts - Net
Balance, beginning of period $16,552 $- $- $113,959 $(42,644)
Realized gains (losses)  6,768  -  -  5,083  -
Movement in unrealized gains (losses)  (2,784)  -  -  7,802  6,397
Purchases and issuances  8,753  -  -  7,375  -
Sales and settlements  (16,094)  -  -  (18,637)  -
Transfers into Level 3  4,933  -  -  5  -
Transfers out of Level 3  -  -  -  (315)  -
Balance, end of period $18,128 $- $- $115,272 $(36,247)
Movement in total gains (losses) above relating to instruments still held at the reporting date $(154) $- $- $5,038 $6,397

                
 Level 3 Assets and Liabilities - Year Ended December 31, 2011
(U.S. dollars in thousands)  Corporate  RMBS - Agency  RMBS - Non Agency  CMBS  CDO
Balance, beginning of period $36,866 $30,255 $4,964 $1,623 $721,572
Realized gains (losses)  (276)  (11)  -  -  (3,458)
Movement in unrealized gains (losses)  92  (145)  -  -  2,404
Purchases and issuances  14,840  6,176  -  -  2,379
Sales and settlements  (10,049)  (4,186)  -  -  (68,165)
Transfers into Level 3  2,105  2,655  -  -  1,886
Transfers out of Level 3  (19,760)  (2,703)  (4,964)  (1,623)  (5,767)
Balance, end of period $23,818 $32,041 $- $- $650,851
Movement in total gains (losses) above relating to instruments still held at the reporting date $92 $(156) $- $- $(6,431)
                
                
 Level 3 Assets and Liabilities - Year Ended December 31, 2011
(U.S. dollars in thousands)  Other asset-backed securities  Non-US Sovereign Government, Provincial, Supranational and Government Related/Supported  Short-term investments  Other investments  Derivative Contracts - Net
Balance, beginning of period $24,650 $3,667 $- $133,717 $(39,195)
Realized gains (losses)  (849)  -  -  11,592  -
Movement in unrealized gains (losses)  6,896  -  -  14,108  (3,173)
Purchases and issuances  -  -  -  12,177  -
Sales and settlements  (9,114)  -  -  (57,635)  (276)
Transfers into Level 3  -  -  -  -  -
Transfers out of Level 3  (5,031)  (3,667)  -  -  -
Balance, end of period $16,552 $- $- $113,959 $(42,644)
Movement in total gains (losses) above relating to instruments still held at the reporting date $12,334 $- $- $23,391 $(3,173)
Schedule Of Financial Instruments Not Carried at Fair Value [Text Block]
  December 31, 2012 December 31, 2011
   Carrying  Fair  Carrying  Fair
(U.S. dollars in thousands) Value  Value  Value  Value
 Fixed maturities, held to maturity$2,814,447 $3,262,804 $2,668,978 $2,895,688
 Other investments - structured transactions.  312,122  293,813  323,705  297,124
Financial Assets $3,126,569 $3,556,617 $2,992,683 $3,192,812
             
 Deposit liabilities$1,551,398 $1,878,499 $1,608,108 $1,809,812
 Notes payable and debt 1,672,778  1,918,134  2,275,327  2,340,148
Financial Liabilities$3,224,176 $3,796,633 $3,883,435 $4,149,960