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Earnings Per Common Share Computations (Tables)
 6 Months Ended
Jun. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Numerator for basic earnings from continuing operations per common share
 
 
 
 
 
 
 
Earnings from continuing operations
$
57,333

 
$
50,309

 
$
56,633

 
$
51,398

Earnings from continuing operations allocated to participating securities
(674
)
 
(1,170
)
 
(668
)
 
(1,198
)
Numerator for basic earnings from continuing operations per common share
$
56,659

 
$
49,139

 
$
55,965

 
$
50,200

Numerator for basic earnings per common share
 
 
 
 
 
 
 
Net earnings
$
57,333

 
$
50,298

 
$
56,633

 
$
51,356

Net earnings allocated to participating securities
(674
)
 
(1,170
)
 
(668
)
 
(1,198
)
Numerator for basic net earnings per common share
$
56,659

 
$
49,128

 
$
55,965

 
$
50,158

 
 
 
 
 
 
 
 
Numerator for diluted earnings from continuing operations per common share
$
57,333

 
$
50,298

 
$
56,633

 
$
51,398

 
 
 
 
 
 
 
 
Numerator for diluted earnings per common share
$
57,333

 
$
50,298

 
$
56,633

 
$
51,356

 
 
 
 
 
 
 
 
Denominator for net earnings per common share:
 
 
 
 
 
 
 
Basic
17,531

 
17,268

 
17,475

 
17,239

Plus dilutive effect of stock options
140

 
242

 
200

 
232

Plus dilutive effect of participating securities
209

 
411

 
209

 
411

Diluted
17,880

 
17,921

 
17,884

 
17,882

 
 
 
 
 
 
 
 
Earnings per common share:
 
 
 
 
 
 
 
Basic
 
 
 
 
 
 
 
Net earnings
$
3.23

 
$
2.85

 
$
3.20

 
$
2.91

Diluted
 
 
 
 
 
 
 
Net earnings
$
3.21

 
$
2.81

 
$
3.17

 
$
2.87