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Stock-based Compensation Plans (Tables)
 3 Months Ended
Mar. 29, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of compensation cost for stock-based payment arrangements, allocation of share-based compensation costs by plan

The Company recognized stock-based compensation expense as follows for the periods indicated:
 
THIRTEEN WEEKS ENDED
(dollars in thousands)
MARCH 29, 2020
 
MARCH 31, 2019
Stock options
$
832

 
$
1,159

Restricted stock units
1,683

 
1,749

Performance-based share units
699

 
1,003

 
$
3,214

 
$
3,911
Schedule of stock-based payment award, stock options, valuation assumptions
Assumptions used in the Black-Scholes option pricing model and the weighted-average fair value of option awards granted were as follows for the periods indicated:
 
THIRTEEN WEEKS ENDED
 
MARCH 29, 2020

MARCH 31, 2019
Assumptions:
 
 
 
Weighted-average risk-free interest rate (1)
0.90
%
 
2.51
%
Dividend yield (2)
4.34
%
 
1.89
%
Expected term (3)
5.5 years

 
5.5 years

Weighted-average volatility (4)
30.43
%
 
31.87
%
 
 
 
 
Weighted-average grant date fair value per option
$
3.12

 
$
5.76

________________
(1)
Risk-free interest rate is the U.S. Treasury yield curve in effect as of the grant date for periods within the expected term of the option.
(2)
Dividend yield is the level of dividends expected to be paid on the Company’s common stock over the expected term of the option.
(3)
Expected term represents the period of time that the options are expected to be outstanding. The Company estimates the expected term based on historical exercise experience for its stock options.
(4)
Based on the historical volatility of the Company’s stock.
Schedule of unrecognized compensation cost, nonvested awards
The following represents unrecognized stock compensation expense and the remaining weighted-average vesting period as of March 29, 2020:
 
UNRECOGNIZED COMPENSATION EXPENSE
(dollars in thousands)
 
REMAINING WEIGHTED-AVERAGE VESTING PERIOD (in years)
Stock options
$
6,127

 
1.8
Restricted stock units
$
16,967

 
2.2
Performance-based share units
$
14,016

 
2.3