Employee Equity-Based Compensation - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Number of Shares
Outstanding, beginning balance (shares) | shares	6,857,124
Granted (shares) | shares	1,054,561
Forfeited (shares) | shares	(117,338)
Exercised (shares) | shares	(288,303)
Expired (shares) | shares	(1)
Outstanding, ending balance (shares) | shares	7,506,043
Weighted Average Exercise Price per Share
Outstanding, beginning balance (dollars per share) | $ / shares	$ 7.72
Granted (dollars per share) | $ / shares	24.54
Forfeited (dollars per share) | $ / shares	22.15
Exercised (dollars per share) | $ / shares	9.29
Expired (dollars per share) | $ / shares	18.07
Outstanding, ending balance (dollars per share) | $ / shares	$ 9.80