Condensed Consolidated Balance Sheets [Parenthetical] - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Preferred stock, shares authorized	7,000,000	7,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares outstanding	91,786,290	87,789,679