SUMMARY OF SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total Income	$ 42,829	$ 43,123	$ 40,084	$ 37,573	$ 37,745	$ 37,329	$ 37,230	$ 34,287	$ 163,609	$ 146,591	$ 129,587
Total Expenses	34,382	35,747	33,348	31,819	31,857	32,387	32,588	29,750	135,296	126,582	111,010
Other Income (Expense)	14,837	(9,112)	11,628	(40,395)	(2,282)	7,519	(3,906)	6,521	(23,042)	7,852	(54,662)
Net Income (Loss) from continuing operations	23,245	(1,767)	18,325	(34,748)	3,531	12,433	749	11,037
Net Income (Loss) Attributable to Common Shareholders	$ 15,591	$ (12,747)	$ 10,235	$ (42,838)	$ (3,433)	$ 5,622	$ (5,537)	$ 5,914	$ (29,759)	$ 2,566	$ (56,532)
Net Income (Loss) Attributable to Common Shareholders per Share - Basic and Diluted	$ 0.38	$ (0.31)	$ 0.25	$ (1.04)
Net Income (Loss) Attributable to Common Shareholders per Share - Basic					$ (0.08)	$ 0.14	$ (0.15)	$ 0.16	$ 0.12	$ 0.70	$ (0.98)
Net Income (Loss) Attributable to Common Shareholders per Share - Diluted					$ (0.08)	$ 0.14	$ (0.15)	$ 0.15	$ 0.12	$ 0.69	$ (0.98)