Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders Equity Note [Abstract]

Company's Outstanding Restricted Stock Grants

The following table sets forth the activity of the Company’s outstanding restricted stock grants, including shares of restricted stock awarded as a result of the achievement of performance objectives under outstanding performance shares awards, in the quarter ended September 30, 2018:

	Shares			Weighted-average grant date fair value
Shares unvested January 1, 2018		221,313		$	31.42
Shares granted		151,143			45.61
Shares for which restrictions lapsed		(177,526	)		42.52
Shares unvested September 30, 2018		194,930		$	41.30