CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized	50,000,000	50,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	500,000,000	500,000,000
Common Stock, issued shares	104,065,045	103,621,629
Common Stock, outstanding shares	104,065,045	103,621,629
Class B Non-Voting Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized shares	10,000,000	10,000,000
Common Stock, issued shares	0	0
Common Stock, outstanding shares	0	0