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STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($)
$ in Thousands
 6 Months Ended
May 11, 2016
Mar. 08, 2016
Jun. 30, 2016
Jun. 30, 2015
Class of Stock [Line Items]        
Net proceeds from issuance of common stock     $ 175,094 $ 0
Common Stock        
Class of Stock [Line Items]        
Issuance of stock shares 5,250,000 4,850,000    
Net proceeds from issuance of common stock $ 99,600 $ 66,500    
Common Stock | Over Allotment Option        
Class of Stock [Line Items]        
Issuance of stock shares   727,500    
Net proceeds from issuance of common stock   $ 10,500    
Underwriters option period   30 days