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RESERVE FOR LOSSES AND LOSS EXPENSES (DETAILS 7)
Dec. 31, 2016
Insurance [Member] | Property and Other Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 35.10%
Year 2 38.50%
Year 3 12.40%
Year 4 5.90%
Year 5 3.40%
Year 6 0.80%
Year 7 2.00%
Year 8 0.10%
Year 9 0.10%
Year 10 (0.20%)
Insurance [Member] | Marine Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 23.40%
Year 2 26.60%
Year 3 16.30%
Year 4 10.80%
Year 5 3.50%
Year 6 2.40%
Year 7 1.70%
Year 8 0.80%
Year 9 1.90%
Year 10 0.20%
Insurance [Member] | Aviation Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.10%
Year 2 25.10%
Year 3 19.70%
Year 4 15.40%
Year 5 8.00%
Year 6 3.50%
Year 7 2.70%
Year 8 2.20%
Year 9 2.30%
Year 10 0.30%
Insurance [Member] | Credit and Political Risk Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.00%
Year 2 60.00%
Year 3 4.20%
Year 4 5.20%
Year 5 (1.40%)
Year 6 0.30%
Year 7 (0.50%)
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Insurance [Member] | Professional Lines Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 3.40%
Year 2 9.60%
Year 3 13.70%
Year 4 15.90%
Year 5 11.60%
Year 6 10.20%
Year 7 6.90%
Year 8 10.90%
Year 9 4.70%
Year 10 0.60%
Insurance [Member] | Liability Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.30%
Year 2 10.70%
Year 3 13.80%
Year 4 16.60%
Year 5 8.80%
Year 6 8.40%
Year 7 5.40%
Year 8 17.00%
Year 9 4.90%
Year 10 2.40%
Reinsurance [Member] | Property and Other Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.20%
Year 2 37.70%
Year 3 19.20%
Year 4 7.70%
Year 5 4.30%
Year 6 2.90%
Year 7 2.00%
Year 8 0.30%
Year 9 (0.50%)
Year 10 0.70%
Reinsurance [Member] | Credit and Surety Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 27.80%
Year 2 30.50%
Year 3 9.30%
Year 4 6.30%
Year 5 2.90%
Year 6 2.10%
Year 7 1.60%
Year 8 6.20%
Year 9 0.50%
Year 10 1.40%
Reinsurance [Member] | Professional Lines Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.70%
Year 2 4.60%
Year 3 11.20%
Year 4 13.60%
Year 5 13.70%
Year 6 11.10%
Year 7 9.60%
Year 8 5.80%
Year 9 6.30%
Year 10 3.70%
Reinsurance [Member] | Motor Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 15.80%
Year 2 10.70%
Year 3 6.00%
Year 4 4.60%
Year 5 4.40%
Year 6 4.90%
Year 7 3.90%
Year 8 5.30%
Year 9 3.10%
Year 10 2.10%
Reinsurance [Member] | Liability Reserve Class [Member]  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.70%
Year 2 8.50%
Year 3 12.70%
Year 4 11.00%
Year 5 10.20%
Year 6 11.10%
Year 7 8.00%
Year 8 3.30%
Year 9 3.10%
Year 10 3.70%