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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 3,375,000 1,875,000
Preferred stock, shares outstanding 3,375,000 1,875,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 647,867,552 643,557,048
Common stock, shares outstanding 534,906,040 553,391,311
Treasury stock, at cost; shares 112,961,512 90,165,737