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Net Income Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
Net (Loss) Income Per Share
The computation of the Company's basic and diluted net (loss) income per share is as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands, except per share data)
Numerator for basic and diluted income per common share:
 
 
 
 
 
Net (loss) income
$
(330,539
)
 
$
97,992

 
$
104,923

Less: Net loss (income) allocated to unvested participating restricted stock
6,519

 
(1,387
)
 
(1,400
)
Net (loss) income available to common stockholders - basic
(324,020
)
 
96,605

 
103,523

     Effect of unvested participating restricted stock
—

 
2

 
4

Numerator - net (loss) income available to common shareholders - diluted
$
(324,020
)
 
$
96,607

 
$
103,527

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted average outstanding shares of common stock - basic
17,725

 
18,030

 
18,637

     Effect of dilutive securities:
 
 
 
 
 
   Stock options
15

 
95

 
131

Weighted average outstanding shares of common stock - diluted
17,740

 
18,125

 
18,768

Net (loss) income per common share:
 
 
 
 
 
Basic
$
(18.28
)
 
$
5.36

 
$
5.55

Diluted
$
(18.28
)
 
$
5.33

 
$
5.52