INVESTMENTS (Credit Losses on AFS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 6,257	$ 0	$ 0	$ 0
Expected credit losses on securities where credit losses were not previously recognized	194	0	22,570	0
Additions (reductions) for expected credit losses on securities where credit losses were previously recognized	(2,545)	0	(9,424)	0
Impairments of securities which the Company intends to sell or more likely than not will be required to sell	0	0	0	0
Securities sold/redeemed/matured	(1,408)	0	(10,648)	0
Balance at end of period	$ 2,498	$ 0	$ 2,498	$ 0