Consolidated Balance Sheets (Parenthetical) - Class A Common Stock [Member] - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Common stock, par value in dollars per share	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	93,912,674	93,702,326
Common stock, shares outstanding	93,912,674	93,702,326