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Consolidated Balance Sheets (Parenthetical)
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Statement Of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 114,055,137 11,805
Common stock, shares outstanding (in shares) 114,054,851 11,750
Treasury stock, at cost (in shares) 1 1