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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses        
Gross reserve for losses and loss expenses, beginning of period     $ 9,596,797 $ 9,582,140
Less reinsurance recoverable on unpaid losses, beginning of period     (1,890,280) (1,900,112)
Net reserve for unpaid losses and loss expenses, beginning of period     7,706,517 7,682,028
Net incurred losses and loss expenses related to:        
Current year     1,818,672 1,855,482
Prior years $ (45,125) $ (64,538) (165,804) (193,385)
Net incurred losses and loss expenses     1,652,868 1,662,097
Net paid losses and loss expenses related to:        
Current year     (185,953) (202,364)
Prior years     (1,293,776) (1,165,215)
Net paid losses and loss expenses     (1,479,729) (1,367,579)
Foreign exchange and other     (183,360) (139,313)
Net reserve for unpaid losses and loss expenses, end of period 7,696,296 7,837,233 7,696,296 7,837,233
Reinsurance recoverable on unpaid losses, end of period 2,007,287 1,914,670 2,007,287 1,914,670
Gross reserve for losses and loss expenses, end of period $ 9,703,583 $ 9,751,903 $ 9,703,583 $ 9,751,903