RESERVE FOR LOSSES AND LOSS EXPENSES (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Favorable Prior Year Reserve Development [Line Items]
Net favorable prior year reserve development	$ 24,793	$ 70,394
Insurance [Member]
Net Favorable Prior Year Reserve Development [Line Items]
Net favorable prior year reserve development	8,619	2,427
Reinsurance [Member]
Net Favorable Prior Year Reserve Development [Line Items]
Net favorable prior year reserve development	$ 16,174	$ 67,967