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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data (Unaudited) [Abstract]  
Selected quarterly financial data and earnings per share
Selected quarterly financial data and earnings per share of the Company are presented below for the years ended December 31, 2012 and 2011 (in thousands, except per share data):

      
Earnings from
  
Net Earnings
  
Dividends
 
      
Continuing Operations
     
Per
     
Per
 
   
Revenues
  
Amount
  
Per Share
  
Amount
  
Share
  
Amount
  
Share
 
                    
 2012 -                   
March 31
  $877,489  $6,050  $1.43  $6,575  $1.56  $-  $- 
June 30
   831,474   5,497   1.31   5,386   1.28   -   - 
September 30
   795,525   8,337   1.98   8,263   1.96   -   - 
December 31
   876,476   7,648   1.81   7,567   1.79   2,615   .62 
Total
  $3,380,964  $27,532  $6.53  $27,791  $6.59  $2,615  $.62 
                               
 2011 -                             
March 31
  $663,846  $5,778  $1.37  $5,583  $1.32  $-  $- 
June 30
   777,538   3,355   .79   3,589   .85   -   - 
September 30
   755,995   9,266   2.20   9,026   2.14   -   - 
December 31
   847,609   5,044   1.19   4,733   1.13   2,404   .57 
Total
  $3,044,988  $23,443  $5.55  $22,931  $5.44  $2,404  $.57