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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Components of Basic and Diluted Earnings Per Share
The components of basic and diluted earnings per share were as follows for the three-month periods ended March 31, 2016 and 2015:
 
Three Months Ended March 31,
(In Thousands Except Share Data)
2016
 
2015
 
Basic
 
Diluted
 
Basic
 
Diluted
Net income
$
22,427

 
$
22,427

 
$
23,679

 
$
23,679

Weighted-average common shares outstanding
25,209,888

 
25,209,888

 
24,990,470

 
24,990,470

Add dilutive effect of restricted stock awards
—

 
154,742

 
—

 
114,313

Add dilutive effect of stock options
—

 
231,807

 
—

 
—

Weighted-average common shares
25,209,888

 
25,596,437

 
24,990,470

 
25,104,783

Earnings per common share
$
0.89

 
$
0.88

 
$
0.95

 
$
0.94

Awards excluded from diluted earnings per share calculation(1)
—

 
180,912

 
—

 
697,950

(1)
Outstanding awards that are not "in-the-money" are excluded from the diluted earnings per share calculation because the effect of including them would have been anti-dilutive.