Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders Equity Note [Abstract]

Company's Restricted Stock Grants

The following table sets forth the activity of the Company’s restricted stock grants to date:

	Shares			Weighted-average grant date fair value
Shares unvested January 1, 2017		199,712		$	24.68
Shares granted		154,382			39.59
Shares for which restrictions lapsed		(132,781	)		43.73
Shares unvested December 31, 2017		221,313		$	31.42