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CALCULATION OF EARNINGS PER COMMON SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Weighted Shares Outstanding
The following tables show the calculation of earnings per common share (in thousands, except per share data):
 
Years Ended December 31
 
2018
 
2017
 
2016
Net income
$
136,515

 
$
60,776

 
$
85,385

Weighted average number of common shares outstanding
 
 
 
 
 
Basic
32,784,724

 
32,888,007

 
33,820,148

Diluted
32,894,425

 
32,986,707

 
33,853,511

Earnings per common share
 
 
 
 
 
Basic
$
4.16

 
$
1.85

 
$
2.52

Diluted
$
4.15

 
$
1.84

 
$
2.52