Equity Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Unvested Restricted Common Stock Activity

A summary of our unvested restricted stock activity during 2017 is as follows (shares in thousands):

	2017
	Shares			Weighted- Average Grant Date Fair Value
Unvested awards, beginning		1,394		$	31.26
Awards granted		621			39.79
Awards forfeited/cancelled		(64	)		33.79
Awards vested		(729	)		28.95
Unvested awards, ending		1,222		$	36.84