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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
 
(in thousands, except per share  amounts, unaudited)
Numerator for basic and diluted EPS — net income allocated to common stockholders
$
15,487

 
$
2,242

 
$
29,104

 
$
18,376

Denominator for basic EPS — weighted average number of shares
29,912

 
30,508

 
30,131

 
30,650

Add — dilutive effect of:
 
 
 
 
 
 
 
Weighted average number of incremental shares issuable from restricted stock units
8

 
5

 
40

 
6

Denominator for diluted EPS — weighted average number of shares and dilutive potential shares
29,920

 
30,513

 
30,171

 
30,656

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.52

 
$
0.07

 
$
0.97

 
$
0.60

Diluted
$
0.52

 
$
0.07

 
$
0.96

 
$
0.60