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Capital Stock and Equity Compensation (Tables)
6 Months Ended
Jun. 30, 2020
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 2020 and 2019:
February 12, 2020June 3, 2019February 7, 2019
Expected volatility41.0%39.7%36.7%
Expected term (in years)2.92.62.9
Risk-free interest rate1.41%1.78%2.43%
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, 2020 is presented below:
Performance-Based
Restricted Stock Units
Awards outstanding as of December 31, 2019106,943  
Awards granted87,244  
Stock issued(75,486) 
Awards forfeited(4,962) 
Awards outstanding as of June 30, 2020113,739  
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, 2020 is presented below:
Time-Based
Restricted Stock Units
Awards outstanding as of December 31, 2019101,685  
Awards granted58,042  
Stock issued(47,197) 
Awards forfeited(3,585) 
Awards outstanding as of June 30, 2020108,945  
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, 2020 is presented below:
Deferred Stock Units
Awards outstanding as of December 31, 20197,150  
Awards granted9,400  
Stock issued(5,100) 
Awards outstanding as of June 30, 202011,450