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Net Income Per Common Share (Tables)
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Basic and diluted net income per common share
Basic and diluted net income per common share calculations are as follows for the periods presented:
 
 
Three Months Ended
 
March 31,
 
2017
 
2016
Basic
 
 
 
Net income applicable to common stock
$
23,972

 
$
21,216

Average common shares outstanding
44,364,337

 
40,324,475

Net income per common share - basic
$
0.54

 
$
0.53

Diluted
 
 
 
Net income applicable to common stock
$
23,972

 
$
21,216

Average common shares outstanding
44,364,337

 
40,324,475

Effect of dilutive stock-based compensation
116,162

 
234,670

Average common shares outstanding - diluted
44,480,499

 
40,559,145

Net income per common share - diluted
$
0.54

 
$
0.52

 
 
 
 
Diluted net income per common share due to their anti-dilutive effect
Stock options that could potentially dilute basic net income per common share in the future that were not included in the computation of diluted net income per common share due to their anti-dilutive effect were as follows for the periods presented:
 
 
Three Months Ended
 
March 31,
 
2017
 
2016
Number of shares
 
21,500
Exercise prices
 
$32.60