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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Numerator (both basic and diluted):
 
 
 
 
 
 
 
Net loss
$
(29,991
)
 
$
(77,281
)
 
$
(57,690
)
 
$
(89,300
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average shares (denominator for basic earnings per share)
64,781

 
64,342

 
64,679

 
64,168

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

 
—

 
—

 
—

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share
64,781

 
64,342

 
64,679

 
64,168

 
 
 
 
 
 
 
 
Loss per common share—Basic
$
(0.46
)
 
$
(1.20
)
 
$
(0.89
)
 
$
(1.39
)
 
 
 
 
 
 
 
 
Loss per common share—Diluted
$
(0.46
)
 
$
(1.20
)
 
$
(0.89
)
 
$
(1.39
)
 
 
 
 
 
 
 
 
Potentially dilutive securities excluded as anti-dilutive
5,095

 
4,718

 
5,152

 
4,894