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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share Based Compensation [Abstract]  
Summary of restricted stock activity

The following table summarizes restricted stock activity from December 30, 2017 through June 30, 2018:

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

average

 

 

 

Number of shares

 

 

grant-date

 

 

 

(in thousands)

 

 

fair value

 

Nonvested balance at December 30, 2017

 

 

88

 

 

$

34.44

 

Granted

 

 

105

 

 

 

53.64

 

Vested

 

 

(24

)

 

 

35.45

 

Forfeitures

 

 

(6

)

 

 

37.29

 

Nonvested balance at June 30, 2018

 

 

163

 

 

$

46.57