INVESTMENTS (Net Realized Gains (Losses) by Major Investment Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gross realized and unrealized gains
Total gross realized and unrealized gains	$ 11,289	$ 2,311	$ 12,994	$ 5,458
Gross Realized and Unrealized Lossses [Abstract]
Debt And Equity Securities, Realized And Unrealized Losses	(906)	(356)	(5,436)	(1,202)
Net realized and unrealized gains (losses) on investments	10,383	1,955	7,558	4,256
Debt Securities
Gross realized and unrealized gains
Debt securities	9,403	834	10,789	1,151
Gross Realized and Unrealized Lossses [Abstract]
Debt Securities, Trading, Realized And Unrealized Losses	(2,339)	(120)	(2,487)	(520)
Equity Securities
Gross realized and unrealized gains
Equity securities	1,886	1,477	2,205	4,307
Gross Realized and Unrealized Lossses [Abstract]
Equity Securities, FV-NI, Realized And Unrealized Losses	$ 1,433	$ (236)	$ (2,949)	$ (682)