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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized shares 1,000,000,000 1,000,000,000
Common stock, issued shares 537,156,480 527,479,528
Common stock, outstanding shares 537,156,480 527,479,528