COMMITMENTS AND CONTINGENCIES (DETAILS 2) - broker	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 1 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	13.00%	11.00%
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 2 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	10.00%	11.00%
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Reinsurer 3 [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	9.00%	11.00%
Reinsurance Recoverable On Unpaid And Paid Losses [Member] | Reinsurer Concentration [Member] | Top Ten Reinsurers [Member] | AM Best, A+ Rating [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	67.00%	72.00%
Gross Premiums Written [Member] | Customer Concentration [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	52.00%	53.00%	56.00%
Concentration risk, number of brokers exceeding threshold	3
Gross Premiums Written [Member] | Customer Concentration [Member] | Marsh & McLennan Companies Inc. [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	21.00%	22.00%	22.00%
Gross Premiums Written [Member] | Customer Concentration [Member] | Aon plc [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	19.00%	18.00%	22.00%
Gross Premiums Written [Member] | Customer Concentration [Member] | Willis Towers Watson PLC [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	12.00%	13.00%	12.00%