Stock-Based Compensation (Notes)

9 Months Ended

Sep. 30, 2018

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

Stock-based compensation expense for three months ended September 30, 2018 and October 1, 2017 was $1.5 million and $0.7 million, respectively and was $4.5 million and $2.5 million for the nine months ended September 30, 2018 and October 1, 2017, respectively.

A summary of all non-vested shares activity for the nine months ended September 30, 2018 was as follows:



	Shares		Weighted Average Grant Date Price
Non-vested at December 31, 2017	722,459		$	12.76
Granted	380,192		13.25
Vested	(306,175	)	12.43
Non-vested at September 30, 2018	796,476		$	13.12

The fair value of non-vested shares is based on the closing price on the date of grant. As of September 30, 2018, the total non-vested unrecognized stock-based compensation expense was approximately $7.1 million and the remaining weighted average vesting period for non-vested shares was 1.7 years. The Company expects to record an additional $1.2 million in stock-based compensation expense related to the vesting of these awards for the remainder of 2018.