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Capital Stock and Equity Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used in Calculation of Fair Value
The following table sets forth the assumptions used in the Monte Carlo calculation for each material award granted in 2021 and 2020:
February 10, 2021February 12, 2020
Expected volatility51.0%41.0%
Expected term (in years)2.92.9
Risk-free interest rate0.18%1.41%
Performance-Based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
A summary of activity of the outstanding performance-based restricted stock units for the six months ended June 30, 2021 is presented below:
Performance-Based
Restricted Stock Units
Awards outstanding as of December 31, 2020111,059 
Awards granted39,955 
Stock issued— 
Awards cancelled(34,020)
Awards outstanding as of June 30, 2021116,994 
Time-Based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
A summary of activity of the outstanding time-based restricted stock units for the six months ended June 30, 2021 is presented below:
Time-Based
Restricted Stock Units
Awards outstanding as of December 31, 2020102,142 
Awards granted46,998 
Stock issued(44,037)
Awards cancelled(5,450)
Awards outstanding as of June 30, 202199,653 
Deferred Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activities
A summary of activity of the outstanding deferred stock units for the six months ended June 30, 2021 is presented below:
Deferred Stock Units
Awards outstanding as of December 31, 202012,450 
Awards granted6,450 
Stock issued(9,400)
Awards outstanding as of June 30, 20219,500 
We recognized $1.2 million of compensation expense related to deferred stock units for the three and six months ended June 30, 2021, and $1.0 million of compensation expense for the three and six months ended June 30, 2020.