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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 1,000,000,000us-gaap_CommonStockSharesAuthorized 1,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 304,164,218us-gaap_CommonStockSharesIssued 303,452,655us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 304,164,218us-gaap_CommonStockSharesOutstanding 303,452,655us-gaap_CommonStockSharesOutstanding