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ADDITIONAL INFORMATION-FINANCIAL STATEMENT SCHEDULE I FINANCIAL INFORMATION OF PARENT COMPANY (Schedule of Parent Company Balance Sheets) (Parenthetical) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
ADDITIONAL INFORMATION-FINANCIAL STATEMENT SCHEDULE I FINANCIAL INFORMATION OF PARENT COMPANY [Abstract]    
Common stock, par value per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 900,000,000us-gaap_CommonStockSharesAuthorized 900,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 127,662,057us-gaap_CommonStockSharesIssued 127,662,057us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 119,942,413us-gaap_CommonStockSharesOutstanding 119,134,135us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 7,719,644us-gaap_TreasuryStockShares 8,527,922us-gaap_TreasuryStockShares