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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computation Of Basic And Diluted Earnings Per Common Share
The computation of basic and diluted earnings per common share is as follows:    
 
Three Months Ended
 
March 31,
(In thousands, except per share amounts)
2018
 
2017
Computation of Basic Earnings Per Share:
 
 
 
Numerator:
 
 
 
Net income
$
25,086

 
$
24,269

Income allocated to participating securities
(155
)
 
(174
)
Net income available to common shareholders
$
24,931

 
$
24,095

Denominator:
 
 
 
Weighted average common shares outstanding – basic
56,464

 
55,941

 
 
 
 
Basic earnings per share
$
0.44

 
$
0.43

 
 
 
 
Computation of Diluted Earnings Per Share:
 
 
 
Numerator:
 
 
 
Net income
$
25,086

 
$
24,269

Income allocated to participating securities
(154
)
 
(174
)
Net income available to common shareholders
$
24,932

 
$
24,095

Denominator:
 
 
 
Weighted average common shares outstanding – basic
56,464

 
55,941

Diluted effect of stock options and PVRSUs
647

 
345

Weighted average common shares outstanding – diluted
57,111

 
56,286

 
 
 
 
Diluted earnings per share
$
0.44

 
$
0.43