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Senior Notes payable and letter of credit facilities - Letters of credit (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Line of Credit Facility [Line Items]  
Line of Credit Facility, Fair Value of Amount Outstanding $ 303,387
Restricted cash securing credit facilities and reinsurance contracts 306,032
Committed, secured facility [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity 225,000
Line of Credit Facility, Fair Value of Amount Outstanding 99,638
Restricted cash securing credit facilities and reinsurance contracts 102,283
Uncommitted, unsecured facility [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Fair Value of Amount Outstanding 203,749
Restricted cash securing credit facilities and reinsurance contracts $ 203,749