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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Historical Claims Duration) (Details)
Dec. 31, 2016
Commercial other liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.40%
Year 2 15.30%
Year 3 15.60%
Year 4 14.30%
Year 5 11.90%
Year 6 5.80%
Year 7 4.80%
Year 8 4.20%
Year 9 3.00%
Year 10 1.40%
Commercial fire and allied  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 63.90%
Year 2 21.00%
Year 3 4.70%
Year 4 3.90%
Year 5 3.70%
Year 6 1.20%
Year 7 0.60%
Year 8 0.20%
Year 9 0.10%
Year 10 0.00%
Commercial automobile  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 40.50%
Year 2 21.20%
Year 3 15.10%
Year 4 11.30%
Year 5 5.50%
Year 6 2.70%
Year 7 1.70%
Year 8 0.20%
Year 9 0.30%
Year 10 0.10%
Workers' compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 26.40%
Year 2 29.10%
Year 3 13.30%
Year 4 8.00%
Year 5 4.40%
Year 6 3.20%
Year 7 2.00%
Year 8 2.80%
Year 9 0.90%
Year 10 0.40%
Personal  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 71.50%
Year 2 19.20%
Year 3 4.00%
Year 4 2.30%
Year 5 0.90%
Year 6 0.30%
Year 7 0.30%
Year 8 0.10%
Year 9 0.10%
Year 10 0.00%