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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation
A reconciliation of basic and diluted net (loss) income per share, together with the related shares outstanding in thousands for the years ended December 31, is as follows:   
Net (Loss) Income Per Share:
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
Net (loss) income
 
$
(95,304
)
 
$
68,271

 
$
(41,276
)
 
 
 
 
 
 
 
Weighted average shares:
 
 

 
 

 
 

Basic shares
 
37,325

 
40,465

 
41,248

Effect of dilutive securities—employee and director equity awards outstanding and 2023 Notes
 
—


1,300


—

Diluted shares
 
37,325

 
41,765

 
41,248

 
 
 
 
 
 
 
Net (loss) income per share - basic
 
$
(2.55
)
 
$
1.69

 
$
(1.00
)
Net (loss) income per share - diluted
 
$
(2.55
)
 
$
1.63

 
$
(1.00
)