EQUITY - Stock Buyback Program and Public Offering (Details) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 29, 2016
Stockholders' Equity Note [Abstract]
Stock repurchase agreement, authorized amount	$ 20,000,000				$ 30,000,000
Period in force	1 year
Stock repurchased and retired during period, shares		0	(129,916)
Stock repurchased and retired during period, value			$ (1,436,000)
Average price per share			$ 11.06
Subscription agreement shares issued		0	0	0