SHAREHOLDERS' EQUITY - Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		0 Months Ended				0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	May 21, 2014 Common Stock	Dec. 10, 2013 Common Stock	Jun. 21, 2013 Common Stock institutional_investor	Dec. 10, 2013 Common Stock	Jun. 21, 2013 Registered Direct Offering Common Stock	May 21, 2014 Over Allotment Option Common Stock	Jul. 02, 2013 Over Allotment Option Common Stock
Class of Stock [Line Items]
Issuance of stock shares			5,150,000	1,509,450	2,268,000		1,153,846	772,500	360,000
Stock issuance and sale, price per share						$ 13.25
Underwriters option period			30 days					30 days	30 days
Number of institutional investors for which direct offering has been made					2
Net proceeds from issuance of common stock	$ 53,901	$ 47,953	$ 50,400	$ 20,000	$ 29,500		$ 15,000	$ 7,600	$ 4,400