CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock and paid in capital, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock and paid in capital, shares authorized (in shares)	370,100,000	370,100,000
Common stock and paid in capital, shares issued (in shares)	295,145,532	284,213,685
Common stock and paid in capital, shares outstanding (in shares)	295,145,532	284,213,685