ASBESTOS AND ENVIRONMENTAL CLAIMS (Details) $ in Thousands	12 Months Ended		120 Months Ended
	Dec. 31, 2018 USD ($) claim policyholder lawsuit	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) claim lawsuit
Liability for Asbestos and Environmental Claims [Abstract]
Average asbestos and environmental losses paid by company per year over past five years	$ 2,800
Reserves for asbestos and environmental related claims, before reinsurance	11,600	$ 11,700	$ 11,600
Reserves for asbestos and environmental related claims, net of reinsurance	$ 11,100	11,400	$ 11,100
Number of asbestos bodily injury lawsuits | lawsuit	1,737		1,737
Number of policyholders producing recent higher paid asbestos amounts | policyholder	1
Company's share of asbestos related claims settled			$ 14,200
Number of asbestos exposure claims associated with furnace manufacturer, a former policyholder, remain open | claim	702		702
Payments for legal settlements		$ 4,500
Asbestos reserve strengthening	$ 1,500