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Supplemental Cash Flow (Table)
6 Months Ended
Jun. 30, 2013
Supplemental Cash Flow Disclosures  
Supplemental cash flow disclosures
  Six Months Ended
  June 30,
  2013 2012
(Dollars and shares in thousands)     
Common Shares withheld  133   78
       
Aggregate value of Common Shares withheld$ 4,782 $ 3,076
       
Cash receipts upon exercise of stock options$ 1,039 $ 627
Cash disbursements for payment of taxes  (3,245)   (3,092)
Net cash receipts (disbursements) from exercise of stock options and vesting of other stock awards$ (2,206) $ (2,465)