Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Common Stock
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	1,280,000,000	640,000,000
Common Stock, Shares Issued (in shares)	578,827,768	576,950,272
Treasury Stock
Common Stock Held in Treasury (in shares)	350,961	250,155