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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Numerator and denominator of the basic and diluted earnings per common share computations
The following summarizes the numerator and denominator of the basic and diluted earnings per common share computations:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income
$
25,707

 
$
19,024

 
$
48,969

 
$
36,859

Denominator for basic earnings per common share, weighted average common shares outstanding
38,258

 
35,162

 
38,228

 
33,992

Weighted average common stock equivalents
342

 
235

 
332

 
235

Denominator for diluted earnings per common share
38,600

 
35,397

 
38,560

 
34,227

Basic earnings per common share
$
0.67

 
$
0.54

 
$
1.28

 
$
1.08

Diluted earnings per common share
$
0.67

 
$
0.54

 
$
1.27

 
$
1.08