CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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, authorized (in shares)	370,100,000	370,100,000
Common stock and paid in capital, issued (in shares)	303,807,421	303,742,090
Common stock and paid in capital, outstanding (in shares)	303,807,421	303,742,090