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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of Earnings (Loss) Per Share
Earnings (loss) per share (in millions, except share data):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Basic:
 
 
 
 
 
Net income (loss)
$
421

 
$
17

 
$
(137
)
Weighted-average shares outstanding(1)
53,591,655

 
53,021,761

 
51,579,112

Basic earnings (loss) per share
$
7.86

 
$
0.33

 
$
(2.65
)
 
 
 
 
 
 
Diluted:
 
 
 
 
 
Net income (loss)
$
421

 
$
17

 
$
(137
)
Weighted-average shares outstanding(1)
53,591,655

 
53,021,761

 
51,579,112

Dilutive shares(2)
708,157

 
667,071

 
—

Diluted weighted-average shares outstanding
54,299,812

 
53,688,832

 
51,579,112

Diluted earnings (loss) per share
$
7.76

 
$
0.32

 
$
(2.65
)


(1)
In periods of net loss, restricted stock awards that are classified as participating securities are excluded from the weighted-average shares outstanding computation.
(2)
In periods of net loss, options are anti-dilutive and therefore excluded from the earnings (loss) per share calculation.