CONDENSED COMBINED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized	50,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0
Common Stock | Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized	100,000,000	0
Common stock, shares issued	8,413,178	0
Common stock, shares outstanding	8,413,178
Common Stock | Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized	100,000,000	0
Common stock, shares issued	6,866,154	0
Common stock, shares outstanding	6,866,154