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Cash, cash equivalents, restricted cash and restricted investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Cash and cash equivalents $ 525,991 $ 639,415    
Restricted cash and cash equivalents 1,187,948 1,014,543    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 1,713,939 1,653,958 $ 713,337 $ 549,333
Restricted investments securing other reinsurance contracts 86,367 142,617    
Cash, cash equivalents, restricted cash, restricted cash equivalents and restricted investments 1,800,306 1,796,575    
Letter of Credit        
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Restricted cash and cash equivalents 306,032 254,176    
Restricted cash securing other reinsurance contracts        
Restricted Cash and Cash Equivalents and Investments Items [Line Items]        
Restricted cash and cash equivalents $ 881,916 $ 760,367