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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Components of Calculation of Basic and Diluted Earnings Per Share
The following table provides a reconciliation of the components used in the calculation of basic and diluted earnings per share utilizing the two-class method for the periods presented:
 
Successor
 
 
Predecessor
 
Year Ended
 
September 13 Through
 
 
January 1 Through
 
Year Ended
 
December 31,
 
December 31,
 
 
September 12,
 
December 31,
 
2017
 
2016
 
 
2016
 
2015
Net income (loss)
$
32,662

 
$
(5,296
)
 
 
$
1,054,602

 
$
(1,582,961
)
Less: Preferred stock dividends 1
—

 
—

 
 
(5,972
)
 
(22,789
)
Net income (loss) attributable to common shareholders – basic and diluted
$
32,662

 
$
(5,296
)
 
 
$
1,048,630

 
$
(1,605,750
)
 
 
 
 
 
 
 
 
 
Weighted-average shares – basic
14,996

 
14,992

 
 
88,013

 
73,639

Effect of dilutive securities 2
67

 
—

 
 
36,074

 
—

Weighted-average shares – diluted
15,063

 
14,992

 
 
124,087

 
73,639

_____________________________________________
1 Preferred stock dividends were excluded from diluted earnings per share for the year ended December 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
2 For the period from September 13, 2016 through December 31, 2016, less than 0.1 million potentially dilutive securities, represented by RSUs, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share. For 2015, approximately 30.2 million potentially dilutive securities, including Predecessor Preferred Stock, stock options and RSUs had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.