CAPITAL STOCK - Completed public offerings ofcommon stock (Details) - USD ($)	3 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Stock Issued During Period Shares New Issues		3,171,000				3,170,727,000	14,377,126
Stock Issued During Period, Value, New Issues	$ 0	$ 19,447,000		$ 28,495,000	$ 8,503,000	$ 19,447,000	$ 92,314,000
At the Market Offering Program [Member]
Weighted Average Price Received Per Share		$ 6.23	$ 6.37	$ 6.70	$ 6.84
Stock Issued During Period Shares New Issues		3,170,727	1,771,301	4,337,931	1,267,894
Stock Issued During Period, Value, New Issues		$ 19,447,000	$ 11,098,000	$ 28,495,000	$ 8,503,000
Follow-on Offering [Member]
Weighted Average Price Received Per Share			$ 6.35
Stock Issued During Period Shares New Issues			7,000,000
Stock Issued During Period, Value, New Issues			$ 44,218,000