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Valuation Account (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation Account [Abstract]  
Schedule of Allowance for Doubtful Accounts Receivable
Dollars in thousands



Additions
 

Balance at the beginning of the period

  

Charged to costs and expenses

  

Deductions
(A)

  

Balance at

the end of 
the period

  

Allowance for doubtful accounts receivable:

    
         

Year ended December 31, 2014

  $  --   $  --   $  --   $  --    

Year ended December 31, 2013

  $ 67   $ (61
 ) $ (6
 ) $ --    

Year ended December 31, 2012

  $ 1,020   $ 17   $ (970
 ) $ 67    
             
   (A)  
Uncollectible accounts receivable written off, net of recoveries