COMMON STOCK ACTIVITY (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of year (in shares)	32,421,460
Common stock offerings (in shares)	875,052	106,751	1,246,400
Stock Issued During Period, Value, New Issues	$ 59,283	$ 6,233	$ 78,868
Dividend reinvestment plan (in shares)	3,326	4,536	3,626
Shares outstanding at end of year (in shares)	33,332,213	32,421,460
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of year (in shares)	32,421,460	32,232,587	30,937,225
Common stock offerings (in shares)	875,052	106,751	1,246,400
Dividend reinvestment plan (in shares)	3,326	4,536	3,626
Incentive restricted stock granted (in shares)	80,529	100,622	71,642
Incentive restricted stock forfeited (in shares)	(910)	0	(2,375)
Director common stock awarded (in shares)	10,072	9,373	7,742
Restricted stock withheld for tax obligations (in shares)	(57,316)	(32,409)	(31,673)
Shares outstanding at end of year (in shares)	33,332,213	32,421,460	32,232,587
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, New Issues	$ 59,283	$ 6,233	$ 78,868