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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 30, 2019
Stock-Based Compensation [Abstract]  
Summary of Recognized Stock-based Compensation Expense
The following table summarizes stock-based compensation expense recognized:

  
Fiscal quarters ended
 
  
March 30, 2019
  
March 31, 2018
 
       
Restricted stock units
 
$
3,359
  
$
2,269
 
Phantom stock units
  
177
   
214
 
Total
 
$
3,536
  
$
2,483
 

Summary of Unrecognized Compensation Cost and Weighted Average Remaining Amortization Periods
The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at March 30, 2019 (amortization periods in years):

  
Unrecognized Compensation Cost
  
Weighted Average Remaining Amortization Periods
 
       
Restricted stock units
 
$
5,669
   
1.0
 
Phantom stock units
  
-
   
0.0
 
Total
 
$
5,669
     

RSU Activity
RSU activity under the 2007 Program as of March 30, 2019 and changes during the three fiscal months then ended are presented below (number of RSUs in thousands):

  
Number of RSUs
  
Weighted Average Grant-date Fair Value per Unit
 
Outstanding:
      
January 1, 2019
  
904
  
$
14.77
 
Granted
  
314
   
19.85
 
Vested*
  
(349
)
  
11.50
 
Cancelled or forfeited
  
-
   
-
 
Outstanding at March 30, 2019
  
869
  
$
17.92
 
         
Expected to vest at March 30, 2019
  
855
     

* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.

RSUs with Performance-Based Vesting Criteria
The number of performance-based RSUs that are scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels.  RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):

Vesting Date
 
Expected to Vest
  
Not Expected to Vest
  
Total
 
January 1, 2020
  
167
   
-
   
167
 
January 1, 2021
  
141
   
-
   
141
 
January 1, 2022
  
174
   
-
   
174
 

Phantom Stock Unit Activity Under the Phantom Stock Plan
Phantom stock unit activity under the phantom stock plan as of March 30, 2019 and changes during the three fiscal months then ended are presented below (number of phantom stock units in thousands):

  
Number of units
  
Grant-date Fair Value per Unit
 
Outstanding:
      
January 1, 2019
  
170
    
Granted
  
10
  
$
17.72
 
Dividend equivalents issued
  
1
     
Outstanding at March 30, 2019
  
181