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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
Nine Months Ended
 
September 30,
 
September 30,
(In thousands, except per share amounts)
2017
 
2016
 
2017
 
2016
Computation of Basic Earnings Per Share:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income
$
47,595

 
$
47,565

 
$
121,334

 
$
107,550

Income allocated to participating securities
(334
)
 
(342
)
 
(861
)
 
(749
)
Net income available to common shareholders
$
47,261

 
$
47,223

 
$
120,473

 
$
106,801

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
56,161

 
55,630

 
56,059

 
55,904

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.84

 
$
0.85

 
$
2.15

 
$
1.91

 
 
 
 
 
 
 
 
Computation of Diluted Earnings Per Share:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income
$
47,595

 
$
47,565

 
$
121,334

 
$
107,550

Income allocated to participating securities
(333
)
 
(341
)
 
(857
)
 
(746
)
Net income available to common shareholders
$
47,262

 
$
47,224

 
$
120,477

 
$
106,804

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding – basic
56,161

 
55,630

 
56,059

 
55,904

Diluted effect of stock options and PVRSUs
345

 
281

 
358

 
296

Weighted average common shares outstanding – diluted
56,506

 
55,911

 
56,417

 
56,200

 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.84

 
$
0.84

 
$
2.14

 
$
1.90