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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Beginning and Ending Gross Unpaid Losses and Loss Expenses      
Gross reserve for losses and loss expenses, beginning of year $ 9,596,797 $ 9,582,140 $ 9,058,731
Less reinsurance recoverable on unpaid losses, beginning of year (1,890,280) (1,900,112) (1,825,617)
Net reserve for unpaid losses and loss expenses, beginning of year 7,706,517 7,682,028 7,233,114
Net incurred losses and loss expenses related to:      
Current year 2,419,247 2,445,666 2,353,631
Prior years (243,048) (258,944) (219,436)
Net incurred losses and loss expenses 2,176,199 2,186,722 2,134,195
Net paid losses and loss expenses related to:      
Current year (343,063) (387,197) (318,006)
Prior years (1,709,659) (1,544,664) (1,373,459)
Net paid losses and loss expenses (2,052,722) (1,931,861) (1,691,465)
Foreign exchange and other (215,018) (230,372) 6,184
Net reserve for unpaid losses and loss expenses, end of year 7,614,976 7,706,517 7,682,028
Reinsurance recoverable on unpaid losses, end of year 2,031,309 1,890,280 1,900,112
Gross reserve for losses and loss expenses, end of year $ 9,646,285 $ 9,596,797 $ 9,582,140