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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
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):
 
December 31
 
2012
 
2011
 
2010
Earnings from continuing operations
$
41,648

 
$
23,865

 
$
39,904

Weighted-average shares outstanding for basic earnings per share
63,461

 
63,284

 
62,807

Common equivalent shares:
 
 
 
 
 
Effect of stock-based compensation awards
959

 
801

 
1,202

Weighted-average shares outstanding assuming dilution
64,420

 
64,085

 
64,009

Basic earnings per share from continuing operations
$
0.66

 
$
0.38

 
$
0.64

Diluted earnings per share from continuing operations
$
0.65

 
$
0.37

 
$
0.62