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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The calculation of basic and diluted earnings per common share follows (in thousands, except per share amounts):
 
Three Months Ending March 31,
 
2013
 
2012
Earnings from continuing operations
$
8,501

 
$
6,662

Weighted-average shares outstanding for basic earnings per share
63,810

 
63,431

Common equivalent shares:
 
 
 
Effect of stock-based compensation awards
714

 
943

Weighted-average shares outstanding assuming dilution
64,524

 
64,374

Basic earnings per share from continuing operations
$
0.13

 
$
0.11

Diluted earnings per share from continuing operations
$
0.13

 
$
0.10