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Unaudited Condensed Consolidated Balance Sheets Parenthetical - $ / shares
Jun. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Common stock, par or stated value per share $ 0.01 $ 0.01
Common stock, shares authorized 207,060,000 207,060,000
Common stock, shares, issued 195,749,034 195,743,154
Common stock, shares, outstanding 195,749,034 195,743,154