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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2015
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 income per share and diluted income per share computations (amounts in thousands, except per share data):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Basic
 
 
 
 
 
 
 
Net income (loss)
$
(17,540
)
 
$
12,453

 
$
(106,840
)
 
$
9,555

 
 
 
 
 
 
 
 
Weighted-average shares
64,449

 
63,451

 
64,262

 
62,960

 
 
 
 
 
 
 
 
Income (loss) per common share—Basic
$
(0.27
)
 
$
0.20

 
$
(1.66
)
 
$
0.15

 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Net income (loss)
$
(17,540
)
 
$
12,453

 
$
(106,840
)
 
$
9,555

 
 
 
 
 
 
 
 
Weighted-average shares
 
 
 
 
 
 
 
Outstanding
64,449

 
63,451

 
64,262

 
62,960

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

 
2,425

 
—

 
2,207

 
64,449

 
65,876

 
64,262

 
65,167

 
 
 
 
 
 
 
 
Income (loss) per common share—Diluted
$
(0.27
)
 
$
0.19

 
$
(1.66
)
 
$
0.15