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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Reserve for losses and loss adjustment expenses at beginning of year $ 16,513,929 $ 13,891,842 $ 11,853,297
Unpaid losses and loss adjustment expenses recoverable 4,314,855 4,082,650 2,814,291
Net reserve for losses and loss adjustment expenses at beginning of year 12,199,074 9,809,192 9,039,006
Net incurred losses and loss adjustment expenses relating to losses occurring in:      
Current year 4,940,987 4,851,051 3,297,037
Prior years (356,184) (161,452) (163,585)
Total net incurred losses and loss adjustment expenses 4,584,803 4,689,599 3,133,452
Net losses and loss adjustment expense reserves of acquired business [1] 104,176 0 209,486
Retroactive reinsurance transaction [2] (444,147) 182,210 (225,500)
Impact of deconsolidation of Somers (1,460,611) 0 0
Foreign exchange (gains) losses and other 1,181 179,190 36,003
Net paid losses and loss adjustment expenses relating to losses occurring in:      
Current year (734,846) (661,529) (621,202)
Prior years (2,091,705) (1,999,588) (1,762,053)
Total net paid losses and loss adjustment expenses (2,826,551) (2,661,117) (2,383,255)
Net reserve for losses and loss adjustment expenses at end of year 12,157,925 12,199,074 9,809,192
Unpaid losses and loss adjustment expenses recoverable 5,599,231 4,314,855 4,082,650
Reserve for losses and loss adjustment expenses at end of year $ 17,757,156 $ 16,513,929 $ 13,891,842
[1] Represents activity related to the Company’s acquisitions in the 2021 and the 2019 period.
[2] See ‘Retroactive Reinsurance Transactions’ section.