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Transactions with Related Parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Purchases of other investments $ 1,808,727 $ 1,470,545 $ 2,014,622
Premia Holdings Ltd.      
Related Party Transaction [Line Items]      
Percentage ownership     25.00%
Purchases of other investments     $ 100,000
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses 199,800 177,700  
Funds held liability $ 149,600 $ 180,000