INVESTMENTS (Credit Losses on AFS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 20,019	$ 0	$ 0	$ 0
Expected credit losses on securities where credit losses were not previously recognized	2,357	0	22,376	0
Additions (reductions) for expected credit losses on securities where credit losses were previously recognized	(6,879)	0	(6,879)	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	(9,240)	0	(9,240)	0
Balance at end of period	$ 6,257	$ 0	$ 6,257	$ 0