INVESTMENTS (Net Realized Gains (Losses) by Major Investment Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gross realized and unrealized gains
Total gross realized and unrealized gains	$ 1,223	$ 2,013	$ 6,681	$ 4,518
Gross Realized and Unrealized Lossses [Abstract]
Debt And Equity Securities, Realized And Unrealized Losses	(429)	(253)	(1,631)	(3,602)
Net realized and unrealized gains (losses) on investments	794	1,760	5,050	916
Debt Securities
Gross realized and unrealized gains
Debt securities	897	91	2,048	355
Gross Realized and Unrealized Lossses [Abstract]
Debt Securities, Trading, Realized And Unrealized Losses	(4)	(253)	(524)	(2,571)
Equity Securities
Gross realized and unrealized gains
Equity securities	326	1,922	4,633	4,163
Gross Realized and Unrealized Lossses [Abstract]
Equity Securities, FV-NI, Realized And Unrealized Losses	$ (425)	$ 0	$ (1,107)	$ (1,031)