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Restricted cash and cash equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash and cash equivalents $ 221,044 $ 193,577
Restricted cash securing collateralized reinsurance contracts written by the Catastrophe Reinsurer
   
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash and cash equivalents 89,446 93,014
Restricted cash securing credit facilities
   
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash and cash equivalents $ 131,598 $ 100,563