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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 25, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Stock-based compensation expense included in selling, general and administrative expenses
Stock-based compensation expense related to stock options, restricted stock awards ("RSAs"), restricted stock units ("RSUs") and performance stock units ("PSUs") is included in selling, general and administrative expenses in the accompanying Consolidated Statements of Operations and is comprised as follows (U.S. dollars in millions): 
 Quarter endedNine months ended
September 25,
2020		September 27,
2019		September 25,
2020		September 27,
2019
RSUs/PSUs$1.6 $0.9 $5.9 $6.0 
RSAs— — 0.3 1.0 
Total$1.6 $0.9 $6.2 $7.0 
Restricted stock awards and related compensation expense
The following table lists RSAs awarded under the 2014 plan for the nine months ended September 25, 2020 and September 27, 2019:
Date of awardShares of
restricted stock
awarded		Price per share
For the nine months ended September 25, 2020
April 10, 2020235$32.00 
January 2, 20207,37434.42 
For the nine months ended September 27, 2019
May 1, 20192,83029.44 
January 2, 201930,89128.32 
RSU and PSUs awarded
The following table lists the various RSUs and PSUs awarded under the 2014 Plan for the nine months ended September 25, 2020 and September 27, 2019:
Date of AwardType of awardUnits awardedPrice per share
For the nine months ended September 25, 2020
April 28, 2020RSU21,348$35.13 
March 30, 2020RSU2,50029.61 
March 23, 2020RSU2,50033.53 
March 2, 2020PSU86,95428.74 
March 2, 2020RSU161,09328.74 
For the nine months ended September 27, 2019
July 31, 2019PSU4,25030.33 
March 25, 2019RSU5,00026.55 
February 20, 2019PSU85,00027.71 
February 20, 2019RSU133,75027.71