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Earnings Per Common Share Computations (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation of the numerator and denominator of the earnings per common share computations (in thousands, except per share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Numerator for basic earnings per common share:
 
 
 
 
 
 
 
Net earnings
$
55,044

 
$
57,333

 
$
53,486

 
$
56,633

Net earnings allocated to participating securities
(913
)
 
(674
)
 
(889
)
 
(668
)
Numerator for basic earnings per common share
$
54,131

 
$
56,659

 
$
52,597

 
$
55,965

 
 
 
 
 
 
 
 
Numerator for diluted earnings per common share
$
55,044

 
$
57,333

 
$
53,486

 
$
56,633

 
 
 
 
 
 
 
 
Denominator basic and diluted net loss per common share:
 
 
 
 
 
 
 
Basic
17,331

 
17,531

 
17,300

 
17,475

Plus dilutive effect of stock options and restricted stock
112

 
140

 
106

 
200

Plus dilutive effect of participating securities
292

 
209

 
292

 
209

Diluted
17,735

 
17,880

 
17,698

 
17,884

 
 
 
 
 
 
 
 
Earnings per common share:
 
 
 
 
 
 
 
Basic
$
3.12

 
$
3.23

 
$
3.04

 
$
3.20

Diluted
$
3.10

 
$
3.21

 
$
3.02

 
$
3.17