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Common Stock and Stock-Based Compensation Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Activity [Table Text Block]
The following table summarizes stock-based compensation awards granted during the three months ended June 30, 2019:
 
Number of Shares Granted
 
Weighted Average Grant-Date
Fair Value per Award
Restricted stock units
953,666

 
$
22.21

Restricted stock awards
17,538

 
$
22.24

Performance units
476,394

 
$
22.22