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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of components of diluted earnings per share
The following table sets forth the components of diluted loss per share (in thousands, except share and per share amounts):
 
 
Year ended December 31, 2017
 
Year ended December 31, 2016
 
Year ended December 31, 2015
Numerator
 
 
 
 
 
 
Net loss
 
$
(185,454
)
 
$
(228,028
)
 
$
(46,005
)
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
Weighted average common stock outstanding – basic
 
53,493,523

 
54,490,979

 
56,843,028

Weighted average common stock outstanding – diluted
 
53,493,523

 
54,490,979

 
56,843,028

 
 
 
 
 
 
 
Loss per basic share
 
$
(3.47
)
 
$
(4.18
)
 
$
(0.81
)
Loss per diluted share
 
$
(3.47
)
 
$
(4.18
)
 
$
(0.81
)
Schedule of antidilutive securities excluded from computation of earnings per share
We excluded the items presented below from the calculation of diluted loss per share as they were antidilutive for the periods indicated:
 
 
Year ended December 31, 2017
 
Year ended December 31, 2016
 
Year ended December 31, 2015
Denominator (in weighted-average shares)
 
 
 
 
 
 
Stock options
 
157,214

 
151,756

 
187,474

Restricted stock
 
164,689

 
24,146

 
3,279