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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Components of basic and diluted weighted-average shares
The following table presents information about basic and diluted weighted-average shares outstanding:
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(in thousands)
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
Numerator (for basic and diluted earnings per share)
 
 
 
 
 
 
 
 
Net income (loss)
 
$
(26,684
)
 
$
12,522

 
$
(20,078
)
 
$
28,898

Less income allocated to RSUs
 
—


(174
)
 
—


(373
)
Numerator for basic and diluted earnings per share
 
$
(26,684
)
 
$
12,348

 
$
(20,078
)
 
$
28,525

Denominator
 
 
 
 
 
 
 
 
Basic weighted-average shares outstanding
 
82,039


83,230


82,140


83,654

Effect of dilutive securities:
 



 



Stock options held by directors
 
—


288

 
—


306

Diluted weighted-average shares outstanding
 
82,039

 
83,518

 
82,140

 
83,960

 
 
 
 
 
 
 
 
 
Anti-dilutive securities (1)
 
1,373

 
—

 
1,373

 
—


(1) 
Amount outstanding at Balance Sheet date, before application of the treasury stock method and not weighted for period outstanding.