CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 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	370,100,000	370,100,000
Common stock and paid in capital, shares issued	290,024,275	284,213,685
Common stock and paid in capital, shares outstanding	290,024,275	284,213,685