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Net Income Per Common Share (Tables)
12 Months Ended
Dec. 31, 2019
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:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Basic
 
 
 
 
 
Net income applicable to common stock
$
167,596

 
$
146,920

 
$
92,188

Average common shares outstanding
58,046,716

 
52,492,104

 
46,874,502

Net income per common share—basic
$
2.89

 
$
2.80

 
$
1.97

Diluted
 
 
 
 
 
Net income applicable to common stock
$
167,596

 
$
146,920

 
$
92,188

Average common shares outstanding
58,046,716

 
52,492,104

 
46,874,502

Effect of dilutive stock-based compensation
179,970

 
134,746

 
127,014

Average common shares outstanding—diluted
58,226,686

 
52,626,850

 
47,001,516

Net income per common share—diluted
$
2.88

 
$
2.79

 
$
1.96


Schedule of potentially dilutive securities excluded from computation of earnings per share
Outstanding stock-based compensation awards 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:
 
Year Ended
 
December 31,
 
2019
 
2018
 
2017
Number of shares
643
 
73,257
 
77,545
Range of exercise prices (for stock option awards)