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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Table)
12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Accounts receivable, allowance for doubtful accounts receivable
The changes in the allowance for doubtful accounts during the years ended December 31, 2012, 2011 and 2010 were as follows:
          
  2012 2011 2010
(Dollars in thousands)        
Beginning balance$ 23,537 $ 25,816 $ 26,624
 Additions, net of recoveries  67,372   62,157   76,292
 Deductions  (64,007)   (64,436)   (77,100)
Ending balance$ 26,902 $ 23,537 $ 25,816