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Computation of Earnings Per Share (Tables)
 3 Months Ended
Apr. 01, 2016
Earnings Per Share Reconciliation [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
   
 
For the Three Months Ended
  
 
April 1,
2016
 
April 3,
2015
In thousands, except per share amounts
 
 
 
 
Net earnings
 
$
9,777

 
$
12,749

 
 
 
 
 
Basic:
 
 
 
 
Weighted average number of shares outstanding
 
27,059

 
27,188

   Basic earnings per share
 
$
0.36

 
$
0.47

 
 
 
 
 
Diluted:
 
 

 
 

Weighted average number of shares outstanding
 
27,059

 
27,188

Weighted average shares issuable on exercise of dilutive stock options
 
135

 
137

Weighted average shares issuable on redemption of convertible notes
 
612

 
553

Total
 
27,806

 
27,878

 
 
 
 
 
   Diluted earnings per share
 
$
0.35

 
$
0.46