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Earnings (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents a reconciliation of the numerators and denominators of the basic earnings per share and diluted earnings per share computations (amounts in thousands, except per share data):
 
Year ended December 31,
 
2017
 
2016
 
2015
Numerator (both basic and diluted):
 
 
 
 
 
Net loss
$
(75,118
)
 
$
(128,391
)
 
$
(155,140
)
Denominator:
 
 
 
 
 
Weighted-average shares (denominator for basic earnings (loss) per share)
77,390

 
65,452

 
64,310

Dilutive effect of outstanding stock options, restricted stock and restricted stock unit awards
—

 
—

 
—

Denominator for diluted earnings (loss) per share
77,390

 
65,452

 
64,310

Loss per common share - Basic
$
(0.97
)
 
$
(1.96
)
 
$
(2.41
)
Loss per common share - Diluted
$
(0.97
)
 
$
(1.96
)
 
$
(2.41
)
Potentially dilutive securities excluded as anti-dilutive
5,116

 
4,953

 
4,832