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Common Stock and Stock-Based Compensation Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Activity [Table Text Block]
The following table summarizes stock-based compensation awards granted during the three months ended March 31, 2020:
 
Number of Shares Granted
 
Weighted Average Grant-Date Fair Value per Award
Stock options
300,000

 
$
5.26

Restricted stock units
119,012

 
$
21.26

The fair value of the stock options granted was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
Three Months Ended March 31, 2020
Exercise price
$
21.61

Risk-free interest rate
1.48
%
Expected life (in years)
6.50

Equity volatility
35.0
%
Dividend yield
3.42
%