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Restricted cash and cash equivalents and investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Cash and cash equivalents $ 639,415 $ 104,183    
Restricted cash and cash equivalents 1,014,543 609,154    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 1,653,958 713,337 $ 549,333 $ 308,891
Restricted investments securing other reinsurance contracts 142,617 239,640    
Cash, cash equivalents, restricted cash, restricted cash equivalents and restricted investments 1,796,575 952,977    
Letter of Credit        
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Restricted cash and cash equivalents 254,176 203,953    
Restricted cash securing other reinsurance contracts        
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Restricted cash and cash equivalents $ 760,367 $ 405,201