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RESERVE FOR LOSSES AND LOSS EXPENSES - Reserve Roll-Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses      
Gross reserve for losses and loss expenses, beginning of year $ 9,697,827 $ 9,646,285 $ 9,596,797
Less reinsurance recoverable on unpaid losses, beginning of year (2,276,109) (2,031,309) (1,890,280)
Net reserve for unpaid losses and loss expenses, beginning of year 7,421,718 7,614,976 7,706,517
Net incurred losses and loss expenses related to:      
Current year 3,487,826 2,496,574 2,419,247
Prior years (200,054) (292,377) (243,048)
Net incurred losses and loss expenses 3,287,772 2,204,197 2,176,199
Net paid losses and loss expenses related to:      
Current year (703,796) (428,153) (343,063)
Prior years (1,880,882) (1,763,696) (1,709,659)
Net paid losses and loss expenses (2,584,678) (2,191,849) (2,052,722)
Foreign exchange and other 1,713,227 (205,606) (215,018)
Net reserve for unpaid losses and loss expenses, end of year 9,838,039 7,421,718 7,614,976
Reinsurance recoverable on unpaid losses, end of year 3,159,514 2,276,109 2,031,309
Gross reserve for losses and loss expenses, end of year $ 12,997,553 $ 9,697,827 $ 9,646,285