INVESTMENTS (Net Realized and Unrealized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on securities sold	$ (76)	$ 42	$ 250	$ 324
Equity Securities
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses)	1,241	1,044	3,625	1,210
Net unrealized gains (losses) still held as of the end-of-period	$ 1,317	$ 1,002	$ 3,375	$ 886