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Income (Loss) per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Income (Loss) Per Share
The following table sets forth the computation of basic and diluted income (loss) per share (in thousands, except per share amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Net income
$
16,178

 
$
7,006

 
$
31,363

 
$
34,792

Less: Undistributed income allocated to participating securities (1)
242

 
92

 
433

 
415

Net income attributable to common stockholders
15,936

 
6,914

 
30,930

 
34,377

Plus: Net income effect of convertible securities
—

 
—

 
—

 
—

Numerator for diluted income per common share
$
15,936

 
$
6,914

 
$
30,930

 
$
34,377

 
 
 
 
 
 
 
 
Basic weighted-average common stock shares outstanding
45,684

 
45,541

 
45,659

 
45,505

Plus: dilutive effects of common stock equivalents
39

 
23

 
41

 
31

Diluted weighted-average common stock shares outstanding
45,723

 
45,564

 
45,700

 
45,536

 
 
 
 
 
 
 
 
Basic income per common share
$
0.35

 
$
0.15

 
$
0.68

 
$
0.76

Diluted income per common share 
$
0.35

 
$
0.15

 
$
0.68

 
$
0.75

________________________________________________________
(1)
Participating securities include restricted stock that has been issued but has not yet vested.