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Earnings (Loss) Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2019
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):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Numerator (both basic and diluted):
 
 
 
 
 
 
 
Net loss
$
(12,944
)
 
$
(18,152
)
 
$
(28,059
)
 
$
(29,291
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares (denominator for basic earnings (loss) per share)
78,430

 
77,944

 
78,371

 
77,776

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

 
—

 
—

 
—

Denominator for diluted earnings (loss) per share
78,430

 
77,944

 
78,371

 
77,776

Loss per common share - Basic
$
(0.17
)
 
$
(0.23
)
 
$
(0.36
)
 
$
(0.38
)
Loss per common share - Diluted
$
(0.17
)
 
$
(0.23
)
 
$
(0.36
)
 
$
(0.38
)
Potentially dilutive securities excluded as anti-dilutive
4,858

 
4,055

 
3,709

 
5,015