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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]  
Weighted-Average Common Shares for the Computation of EPS
The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the years ended December 31:
  
Years Ended December 31,
 
(in thousands except per share amounts)
 
2016
  
2015
  
2014
 
Numerator:
         
Net earnings from continuing operations
 
$
122,913
  
$
107,247
  
$
81,771
 
Denominator:
            
Denominator for basic earnings per share - weighted average common shares
  
44,523
   
45,910
   
48,525
 
Effect of dilutive securities
  
320
   
294
   
294
 
Denominator for diluted earnings per share - diluted weighted average shares outstanding
  
44,843
   
46,204
   
48,819
 
             
Earnings per common share from continuing operations
            
Basic
 
$
2.76
  
$
2.34
  
$
1.69
 
Diluted
 
$
2.74
  
$
2.32
  
$
1.67