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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computations of Basic and Diluted Earnings Per Share
The computations of basic and diluted EPS are set forth below:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands, except per share  amounts, unaudited)
Numerator for basic and diluted EPS — net income allocated to common stockholders
$
6,245

 
$
19,628

 
$
5,499

 
$
23,985

Denominator for basic EPS — weighted average number of shares
31,934

 
31,713

 
32,151

 
31,899

Add — dilutive effect of:
 
 
 
 
 
 
 
Weighted average number of incremental shares issuable from restricted stock units
44

 
—

 
100

 
—

Denominator for diluted EPS — weighted average number of shares and dilutive potential shares
31,977

 
31,713

 
32,252

 
31,899

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.20

 
$
0.62

 
$
0.17

 
$
0.75

Diluted
$
0.20

 
$
0.62

 
$
0.17

 
$
0.75