COMMON STOCK ACTIVITY (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of year (in shares)	36,501,356
Common stock offerings (in shares)	2,388,342	1,706,474	1,370,457
Dividend reinvestment plan (in shares)	1,893	1,844	2,744
Shares outstanding at end of year (in shares)	38,925,953	36,501,356
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of year (in shares)	36,501,356	34,758,167	33,332,213
Common stock offerings (in shares)	2,388,342	1,706,474	1,370,457
Dividend reinvestment plan (in shares)	1,893	1,844	2,744
Incentive restricted stock granted (in shares)	59,943	50,217	93,285
Incentive restricted stock forfeited (in shares)	(3,010)	0	(16,000)
Director common stock awarded (in shares)	6,384	8,478	8,881
Director restricted stock granted (in shares)	0	0	282
Restricted stock withheld for tax obligations (in shares)	(28,955)	(23,824)	(33,695)
Shares outstanding at end of year (in shares)	38,925,953	36,501,356	34,758,167
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net proceeds from common stock issuances	$ 284,710	$ 157,319