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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012 (in thousands, except per share data):

      
Earnings from
  
 
    
      
Continuing Operations
  
Net Earnings
  
Dividends
 
   
Revenues
  
Amount
  
Per Share
  
Amount
  
Per Share
  
Amount
  
Per Share
 
                    
 2013 -                   
March 31
  $952,435  $8,073  $1.91  $8,015  $1.90  $-  $- 
June 30
   965,098   6,521   1.55   6,330   1.50   928   .22 
September 30
   1,060,340   7,238   1.72   7,156   1.70   927   .22 
December 31
   968,096   289   .06   109   .02   928   .22 
Total
  $3,945,969  $22,121  $5.24  $21,610  $5.12  $2,783  $.66 
                               
 2012 -                             
March 31
  $875,905  $5,944  $1.41  $6,575  $1.56  $-  $- 
June 30
   830,110   5,333   1.26   5,386   1.28   -   - 
September 30
   794,404   8,355   1.98   8,263   1.96   -   - 
December 31
   875,666   7,840   1.86   7,567   1.79   2,615   .62 
Total
  $3,376,085  $27,472  $6.51  $27,791  $6.59  $2,615  $.62