STOCKHOLDERS' EQUITY - Common Stock (Details) - USD ($) $ in Thousands			9 Months Ended
	May 11, 2016	Mar. 08, 2016	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Net proceeds from issuance of common stock			$ 175,090	$ 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	$ 100,000	$ 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