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M. STOCKHOLDERS' EQUITY - NARRATIVE (Details) - USD ($)
 1 Months Ended 12 Months Ended 18 Months Ended
Mar. 02, 2017
Oct. 17, 2016
Jun. 03, 2015
Mar. 28, 2014
Mar. 25, 2014
Mar. 19, 2014
Oct. 01, 2013
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Nov. 30, 2015
Common stock shares authorized                 45,000,000 45,000,000   45,000,000  
Preferred Stock shares authorized                 5,000,000 5,000,000   5,000,000  
Warrants outstanding                 $ 0     $ 0  
Stock sold new, shares issued         1,600,000 2,000,000 3,600,000            
Issuance of common stock, net value                 27,237,000 $ 38,648,000 $ 45,681,000    
Net proceeds from sale of stock           $ 45,700,000 $ 31,500,000            
Additional paid in capital                         $ 6,000,000
Weighted average price per share           $ 24.25 $ 10.00            
Aggregate share price     $ 140,000,000                    
Common stock, shares         1,600,000 2,000,000 3,600,000            
Share price           $ 24.25 $ 10.00            
Proceeds from common share                 $ 27,237,000 $ 38,648,000 $ 45,681,000    
ATM Offering [Member]                          
Stock sold new, shares issued   250,000,000           1,900,000          
Issuance of common stock, net value               $ 38,600,000          
Weighted average price per share               $ 21.54          
Common stock, shares   250,000,000           1,900,000          
Proceeds from common share $ 48,800,000                        
Second ATM Offering [Member]                          
Stock sold new, shares issued   50,000,000             1.10        
Weighted average price per share                 $ 24.85        
Common stock, shares   50,000,000             1.10        
Proceeds from common share                 $ 27,200,000        
Raymond James & Associates [Member] | ATM Offering [Member]                          
Aggregate share price                       $ 40,000,000  
Over-Allotment Option [Member]                          
Stock sold new, shares issued       400,000                  
Common stock, shares       400,000