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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations The following table reconciles the numerator (i.e., income) and denominator (i.e., shares) of the basic and diluted earnings per share computations for the periods presented (in thousands, except per share data):
 
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Numerator for EPS:
 
 
 
 
 
 
Net income
 
$
117,051

 
$
106,935

 
$
99,410

Less: Preferred stock dividends
 
(10
)
 
(10
)
 
(10
)
Income available to common stockholders
 
$
117,041

 
$
106,925

 
$
99,400

Denominator for EPS:
 
 

 
 

 
 

Weighted average common shares outstanding
 
34,856

 
34,841

 
34,919

Plus: Assumed conversion of share-based compensation (1)
 
905

 
943

 
706

Assumed conversion of preferred stock
 
25

 
25

 
25

Weighted average diluted common shares outstanding
 
35,786

 
35,809

 
35,650

Basic earnings per common share
 
$
3.36

 
$
3.07

 
$
2.85

Diluted earnings per common share
 
$
3.27

 
$
2.99

 
$
2.79

Weighted average number of antidilutive shares
 
445

 
1,504

 
1,583

 
(1)
Represents the dilutive effect of unexercised Stock Options, unvested Performance Share Units and unvested Restricted Stock.