Equity Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Dec. 31, 2016	Jun. 30, 2017
Weighted Average Exercise Price
Unrecognized compensation costs		$ 21,200
Stock option awards
Options
Outstanding, beginning of period (in shares)		2,735,500
Exercised (in shares)		0
Granted (in shares)		1,547,500
Forfeited (in shares)		(223,000)
Outstanding, end of period (in shares)	2,735,500	4,060,000
Exercisable (in shares)		0
Weighted Average Exercise Price
Outstanding, beginning of period (In dollars per share)		$ 14.67
Exercised (in dollars per share)		0.00
Granted (in dollars per share)		17.97
Forfeited (in dollars per share)		14.54
Outstanding, end of period (In dollars per share)	$ 14.67	15.94
Exercisable (in dollars per share)		$ 0.00
Outstanding, weighted average remaining term	5 years 9 months 18 days	5 years 6 months
Granted, weighted average remaining term		5 years 7 months 6 days
Forfeited, weighted average remaining term		5 years 3 months 8 days
Outstanding, aggregate intrinsic value	$ 13,804	$ 3,018
Granted, aggregate intrinsic value		36
Forfeited, aggregate intrinsic value		289
Exercisable, aggregate intrinsic value		$ 0
Unrecognized compensation costs, period for recognition		2 years 6 months