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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014 (in thousands, except per share data):

      
Earnings (Loss) from
  
 
    
      
Continuing Operations
  
Net Earnings (Loss)
  
Dividends
 
   
Revenues
  
Amount
  
Per Share
  
Amount
  
Per Share
  
Amount
  
Per Share
 
                    
 2015 -                   
March 31
  $555,573  $3,097  $.73  $3,097  $.73  $928  $.22 
June 30
   600,558   4,340   1.03   4,340   1.03   928   .22 
September 30
   439,893   (308)  (.07)  (308)  (.07)  928   .22 
December 31
   348,255   (8,404)  (1.99)  (8,404)  (1.99)  928   .22 
Total
  $1,944,279  $(1,275) $(.30) $(1,275) $(.30) $3,712  $.88 
                               
 2014 -                             
March 31
  $949,189  $5,363  $1.27  $5,363  $1.27  $928  $.22 
June 30
   1,159,931   3,975   .94   3,975   .94   928   .22 
September 30
   1,173,970   3,855   .92   3,855   .92   928   .22 
December 31
   849,736   (6,974)  (1.65)  (6,670)  (1.58)  927   .22 
Total
  $4,132,826  $6,219  $1.48  $6,523  $1.55  $3,711  $.88