INVESTMENTS (Summary of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investment Income, Interest and Dividend [Abstract]
Interest income	$ 2,927	$ 2,411	$ 5,815	$ 4,581
Dividends income	51	149	106	297
Net investment income	$ 2,978	$ 2,560	$ 5,921	$ 4,878