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RESERVE FOR LOSSES AND LOSS EXPENSES - Reserve Roll-Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses      
Gross reserve for losses and loss expenses, beginning of year $ 12,280,769 $ 12,997,553 $ 9,697,827
Less reinsurance recoverable on unpaid losses, beginning of year (3,501,669) (3,159,514) (2,276,109)
Net reserve for unpaid losses and loss expenses, beginning of year 8,779,100 9,838,039 7,421,718
Net incurred losses and loss expenses related to:      
Current year 3,123,698 3,389,949 3,487,826
Prior years (78,900) (199,662) (200,054)
Net incurred losses and loss expenses 3,044,798 3,190,287 3,287,772
Net paid losses and loss expenses related to:      
Current year (598,988) (724,199) (703,796)
Prior years (2,371,637) (2,368,615) (1,880,882)
Net paid losses and loss expenses (2,970,625) (3,092,814) (2,584,678)
Foreign exchange and other 21,052 (1,156,412) 1,713,227
Net reserve for unpaid losses and loss expenses, end of year 8,874,325 8,779,100 9,838,039
Reinsurance recoverable on unpaid losses, end of year 3,877,756 3,501,669 3,159,514
Gross reserve for losses and loss expenses, end of year $ 12,752,081 $ 12,280,769 $ 12,997,553