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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
28,274

 
$
(1,412
)
 
$
76,158

 
$
23,435

 
 
 
 
 
 
 
 
 
Denominator (in thousands):
 
 
 
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
47,628

 
34,631

 
48,090

 
30,372

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options and nonvested stock awards
 
40

 
—

 
27

 
—

Weighted-average common shares for calculating diluted earnings per share
 
47,668

 
34,631

 
48,117

 
30,372

 
 
 
 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.59

 
$
(0.04
)
 
$
1.58

 
$
0.77

Diluted
 
$
0.59

 
$
(0.04
)
 
$
1.58

 
$
0.77