A summary of the Company’s restricted stock unit activity with respect to the three months ended March 31, 2019 is as follows:

	Number of Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018		794		$	19.51
Granted		288		$	23.50
Vested		(124	)	$	14.21
Forfeited		(5	)	$	20.28
Nonvested at March 31, 2019		953		$	21.40

Included in the number of shares granted in the table directly above are 55 market performance-based restricted stock units (“MPRSUs”) granted to executives in 2019. Vesting of these MPRSUs is contingent upon the Company meeting certain total shareholder return (“TSR”) levels as compared to a select peer group over three years from the year granted. The 2019 MPRSUs cliff vest at the end of the three-year period and have a maximum potential to vest at 200% (111 shares) based on TSR performance. The related share-based compensation expense is determined based on the estimated fair value of the underlying shares on the date of grant and is recognized straight-line over the vesting term. The estimated fair value per share of the MPRSUs was $26.72.

As of March 31, 2019 and December 31, 2018, there was $14,034 and $9,517 of total unrecognized compensation cost related to restricted stock units granted under the Company’s stock plans, respectively. That cost is expected to be recognized over a weighted average period of 2.6 years and 2.1 years for each of the respective periods.