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Net Loss Per Common Share
 12 Months Ended
Dec. 31, 2019
Net Loss Per Common Share [Abstract]  
Net Loss Per Common Share
(16)
Net Loss Per Common Share:
The reconciliation of the net loss per common share calculation for the years ended December 31, 2019, 2018 and 2017 is as follows:

($ in millions and shares in thousands, except per share amounts)
  
2019
    
2018
    
2017
  
                   
Net loss used for basic and diluted earnings (loss) per share:
                  
Net loss attributable to Frontier common shareholders
  
$
(5,911
)
  
$
(750
)
  
$
(2,018
)
Less:  Dividends paid on unvested restricted stock awards
    
-
      
-
      
(2
)
Total basic net loss attributable to Frontier common shareholders
  
$
(5,911
)
  
$
(750
)
  
$
(2,020
)
                         
Effect of loss related to dilutive stock units
    
-
      
-
      
-
  
Total diluted net loss attributable to Frontier common shareholders
  
$
(5,911
)
  
$
(750
)
  
$
(2,020
)
                         
Basic earnings (loss) per share:
                        
Total weighted average shares and unvested restricted stock awards outstanding – basic
    
105,356
      
91,523
      
78,409
  
Less:  Weighted average unvested restricted stock awards
    
(1,291
)
    
(1,840
)
    
(673
)
Total weighted average shares outstanding – basic
    
104,065
      
89,683
      
77,736
  
                         
Basic net loss per share attributable to Frontier common shareholders
  
$
(56.80
)
  
$
(8.37
)
  
$
(25.99
)
                         
Diluted earnings (loss) per share:
                        
Total weighted average shares outstanding – basic
    
104,065
      
89,683
      
77,736
  
Effect of dilutive shares
    
-
      
-
      
-
  
Total weighted average shares outstanding – diluted
    
104,065
      
89,683
      
77,736
  
                         
Diluted net loss per share attributable to Frontier common shareholders
  
$
(56.80
)
  
$
(8.37
)
  
$
(25.99
)

In calculating diluted net loss per common share for the years ended December 31, 2019, 2018 and 2017 the effect of all common stock equivalents is excluded from the computation as the effect would be antidilutive.

Stock Options
For each of the years ended December 31, 2019, 2018 and 2017, options to purchase 1,334 shares, issuable under employee compensation plans were excluded from the computation of diluted earnings (loss) per share (EPS) for those periods because the exercise prices were greater than the average market price of our common stock and, therefore, the effect would be antidilutive.

Stock Units
At December 31, 2019, 2018 and 2017, we had 339,544, 348,093 and 203,952 stock units, respectively, issued under the Director Plans and the 2013 EIP. These securities have not been included in the diluted income per share of common stock calculation because their inclusion would have an antidilutive effect.

Mandatory Convertible Preferred Stock
The impact of the common share equivalents associated with approximately 19,250,000 shares of Series A Preferred stock described above were not included in the calculation of diluted EPS as of December 31, 2017, as their impact was antidilutive.