Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Assumptions Long-Term Awards (Details)

v3.20.4
Stock-Based Compensation - Assumptions Long-Term Awards (Details) - Long-Term Awards [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
2020 Program [Member]        
Fair value $ 13.47      
Target awards 70      
Volatility 28.75%      
Risk-free rate 0.72%      
Dividend assumption reinvested      
Expected term in years 3 years      
2019 Program [Member]        
Fair value   $ 10.07    
Target awards   82    
Volatility   31.70%    
Risk-free rate   2.50%    
Dividend assumption   reinvested    
Expected term in years   3 years    
2018 Program [Member]        
Fair value     $ 8.86  
Target awards     110  
Volatility     33.80%  
Risk-free rate     2.60%  
Dividend assumption     reinvested  
Expected term in years     2 years 8 months 12 days  
2017 Program [Member]        
Fair value       $ 8.86
Target awards       96
Dividend assumption       reinvested
2017 Program [Member] | Maximum        
Volatility       35.40%
Risk-free rate       2.60%
Expected term in years       2 years 8 months 12 days
2017 Program [Member] | Minimum        
Volatility       33.80%
Risk-free rate       2.40%
Expected term in years       1 year 8 months 12 days