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STOCK-BASED COMPENSATION
 9 Months Ended
Sep. 23, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION

We record stock-based compensation expense for restricted and unrestricted stock awards, performance share units, and shares purchased under an employee stock purchase plan.
Our 2016 Omnibus Incentive Plan, effective May 11, 2016 (“Incentive Plan"), provides for the issuance or delivery of up to 1.54 million shares of our common stock over the full term of the Incentive Plan.

Restricted and unrestricted stock awards and performance share units
Under the Incentive Plan, restricted stock awards are granted to executive officers and key employees and vest annually over three or four years. Unrestricted stock awards granted to our Board of Directors vest immediately. Restricted and unrestricted stock-based compensation expense is calculated based on the grant-date market value. We recognize compensation expense on a straight-line basis over the vesting period, net of estimated forfeitures.
Performance share units have been granted to executive officers and certain key employees. Vesting of the performance share units is contingent upon the achievement of revenue and profitability growth goals at the end of each three-year performance period. Each performance share unit is equivalent to one share of common stock. Compensation expense is calculated based on the grant-date market value of our stock and is recognized ratably over the performance period for the performance share units which are expected to vest. Our estimate of the performance units expected to vest is reviewed and adjusted as appropriate each quarter.

Restricted and unrestricted stock awards and performance share units activity for the thirty-nine weeks ended September 23, 2016, was as follows (shares in thousands):
 
Shares
 
Weighted- average grant-date price
Non-vested at beginning of period
1,218

 
$
22.63

Granted
577

 
$
21.58

Vested
(473
)
 
$
20.75

Forfeited
(87
)
 
$
21.42

Non-vested at the end of the period
1,235

 
$
22.84


As of September 23, 2016, total unrecognized stock-based compensation expense related to non-vested restricted stock was approximately $11.4 million, which is estimated to be recognized over a weighted average period of 1.6 years. As of September 23, 2016, total unrecognized stock-based compensation expense related to performance share units was approximately $3.4 million, which is estimated to be recognized over a weighted average period of 1.8 years.
Employee Stock Purchase Plan

Our Employee Stock Purchase Plan (“ESPP”) reserves for purchase 1.0 million shares of common stock. The plan allows eligible employees to contribute up to 10% of their earnings toward the monthly purchase of the Company's common stock. The employee's purchase price is 85% of the lesser of the fair market value of shares on either the first day or the last day of each month. We consider our ESPP to be a component of our stock-based compensation and accordingly we recognize compensation expense over the requisite service period for stock purchases made under the plan. The requisite service period begins on the enrollment date and ends on the purchase date, the duration of which is one month.

During the thirty-nine weeks ended September 23, 2016 and September 25, 2015, participants purchased approximately 65,000 and 49,000 shares from the plan, for cash proceeds of $1.2 million and $1.0 million, respectively.
Stock-based compensation expense
Total stock-based compensation expense, which is included in Selling, general and administrative expenses on our Consolidated Statements of Operations and Comprehensive Income (Loss), was $1.4 million and $2.5 million for the thirteen weeks ended September 23, 2016 and September 25, 2015, respectively, and $7.4 million and $8.3 million for the thirty-nine weeks ended September 23, 2016 and September 25, 2015, respectively.