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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
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 4,475,000 4,475,000
Preferred stock, shares outstanding 4,475,000 4,475,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 661,724,927 653,736,607
Common stock, shares outstanding 485,525,340 480,218,547
Treasury stock, common, shares 176,199,587 173,518,060