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COMMON STOCKHOLDERS' EQUITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
COMMON STOCKHOLDERS' EQUITY      
Common stock, issued (in shares) 47,806,190us-gaap_CommonStockSharesIssued 47,740,957us-gaap_CommonStockSharesIssued  
Common stock, outstanding (in shares) 47,806,190us-gaap_CommonStockSharesOutstanding 47,740,957us-gaap_CommonStockSharesOutstanding  
Common stockholders' equity      
Issuance of common stock $ 2,195,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 107,409,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 1,442,000us-gaap_StockIssuedDuringPeriodValueNewIssues
IPO      
Common stockholders' equity      
Issuance of common stock   $ 5,750,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember