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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2016
 
2015
 
(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income
$
23,262

 
$
17,835

Denominator for basic earnings per common share, weighted average common shares outstanding
38,198

 
32,809

Weighted average common stock equivalents
323

 
235

Denominator for diluted earnings per common share
38,521

 
33,044

Basic earnings per common share
$
0.61

 
$
0.54

Diluted earnings per common share
$
0.60

 
$
0.54