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Earnings Per Common Share Computations (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Numerator for basic earnings from continuing operations per common share
 
 
 
 
 
 
 
Earnings from continuing operations
$
50,298

 
$
48,576

 
$
51,357

 
$
49,930

Earnings from continuing operations allocated to participating securities
(1,170
)
 
(722
)
 
(1,197
)
 
(743
)
Numerator for basic earnings from continuing operations per common share
$
49,128

 
$
47,854

 
$
50,160

 
$
49,187

Numerator for basic earnings per common share
 
 
 
 
 
 
 
Net earnings
$
50,298

 
$
48,576

 
$
51,356

 
$
49,929

Net earnings allocated to participating securities
(1,170
)
 
(723
)
 
(1,197
)
 
(743
)
Numerator for basic net earnings per common share
$
49,128

 
$
47,853

 
$
50,159

 
$
49,186

 
 
 
 
 
 
 
 
Numerator for diluted earnings from continuing operations per common share
$
50,298

 
$
48,576

 
$
51,357

 
$
49,930

 
 
 
 
 
 
 
 
Numerator for diluted earnings per common share
$
50,298

 
$
48,576

 
$
51,356

 
$
49,929

 
 
 
 
 
 
 
 
Denominator for net earnings per common share:
 
 
 
 
 
 
 
Basic
17,268

 
16,978

 
17,239

 
16,940

Plus dilutive effect of stock options
242

 
268

 
232

 
247

Plus dilutive effect of participating securities
411

 
256

 
411

 
256

Diluted
17,921

 
17,502

 
17,882

 
17,443

 
 
 
 
 
 
 
 
Net earnings per common share:
 
 
 
 
 
 
 
Basic
 
 
 
 
 
 
 
Earnings from continuing operations and net earnings
$
2.85

 
$
2.82

 
$
2.91

 
$
2.90

Diluted
 
 
 
 
 
 
 
Earnings from continuing operations and net earnings
$
2.81

 
$
2.77

 
$
2.87

 
$
2.86