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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
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 EPS computations for the periods presented (in thousands, except per share data):
 
Three Months Ended
March 31,
 
2019
 
2018
Numerator for EPS:
 
 
 
Net income
$
40,148

 
$
40,055

Less: Preferred stock dividends
(3
)
 
(3
)
Income available to common stockholders
$
40,145

 
$
40,052

Denominator for EPS:
 

 
 

Weighted average common shares outstanding
34,741

 
34,839

Plus: Assumed conversion of share-based compensation (1)
440

 
796

     Assumed conversion of preferred stock
25

 
25

Weighted average diluted common shares outstanding
35,206

 
35,660

Basic earnings per common share
$
1.16

 
$
1.15

Diluted earnings per common share
$
1.14

 
$
1.12

(1)
Represents the dilutive effect of unvested restricted stock, unvested performance share units
and unexercised stock options.