Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Grants to Executives) (Details)

v3.20.4
Share-Based Compensation and Other Compensation Matters (Grants to Executives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Jan. 01, 2018
Jan. 01, 2017
Mar. 01, 2016
Dec. 31, 2020
Performance-based PIUs | Former Executive Vice President and Chief Operating Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Forfeitures (in shares)           73,184
Performance-based PIUs | 2019 PB PIU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (in shares or units)   193,682        
Grant Date Fair Value   $ 2,415        
Unvested at the end of the period (in shares)           156,104
Performance-based PIUs | 2020 PB PIU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (in shares or units) 176,758          
Grant Date Fair Value $ 2,891          
Unvested at the end of the period (in shares)           141,152
Performance share units | 2016 PSU Grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (in shares or units)         26,299  
Grant Date Fair Value         $ 1,005  
Unvested at the end of the period (in shares)           0
Performance share units | 2017 PSU Grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (in shares or units)       39,351    
Grant Date Fair Value       $ 1,415    
Unvested at the end of the period (in shares)           0
Performance share units | 2018 PSU Grants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted (in shares or units)     59,110      
Grant Date Fair Value     $ 1,890      
Unvested at the end of the period (in shares)           46,912
Performance share units | 2018 PSU Grants | Former Executive Vice President and Chief Operating Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Forfeitures (in shares)           12,198