Stock-Based Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Movement in Outstanding Shares of Restricted Class A Common Stock and Weighted-Average Grant Date Fair Value Per Share

The following table details the movement in our outstanding shares of restricted class A common stock and the weighted-average grant date fair value per share:

	Restricted Class A Common Stock			Weighted-Average Grant Date Fair Value Per Share
Balance as of December 31, 2017		1,484,175		$	30.61
Granted		318,741			31.83
Vested		(136,738	)		28.92
Forfeited		(8,966	)		30.54
Balance as of March 31, 2018		1,657,212		$	30.98