REINSURANCE (Reinsurance Programs) (Details) - Property and Casualty Insurance - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Casualty excess of loss
Reinsurance [Line Items]
Stated Retention	$ 2,500,000	$ 2,000,000	$ 2,000,000
Limits	$ 40,000,000	$ 40,000,000	$ 40,000,000
Percentage of Coverage	100.00%	100.00%	100.00%
Coverage	$ 37,500,000	$ 38,000,000	$ 38,000,000
Property excess of loss
Reinsurance [Line Items]
Stated Retention	2,500,000	2,000,000	2,000,000
Limits	$ 25,000,000	$ 25,000,000	$ 15,000,000
Percentage of Coverage	100.00%	100.00%	100.00%
Coverage	$ 22,500,000	$ 23,000,000	$ 13,000,000
Surety excess of loss
Reinsurance [Line Items]
Stated Retention	1,500,000	1,500,000	1,500,000
Limits	$ 36,000,000	$ 36,000,000	$ 28,000,000
Percentage of Coverage	100.00%	96.00%	91.00%
Coverage	$ 34,500,000	$ 34,500,000	$ 26,500,000
Property catastrophe, excess
Reinsurance [Line Items]
Stated Retention	20,000,000	20,000,000	20,000,000
Limits	$ 250,000,000	$ 200,000,000	$ 200,000,000
Percentage of Coverage	100.00%	100.00%	100.00%
Coverage	$ 230,000,000	$ 180,000,000	$ 180,000,000
Property catastrophe, excess two
Reinsurance [Line Items]
Stated Retention		200,000,000	200,000,000
Limits		$ 250,000,000	$ 250,000,000
Percentage of Coverage		90.50%	90.50%
Coverage		$ 50,000,000	$ 50,000,000
Boiler and machinery
Reinsurance [Line Items]
Limits	$ 50,000,000	$ 50,000,000	$ 50,000,000
Percentage of Coverage	100.00%	100.00%	100.00%
Coverage	$ 50,000,000	$ 50,000,000	$ 50,000,000