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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Derivative Financial Instruments  
Schedule of derivative financial instruments
         
   Balance Sheet Location Notional Amount (1) Carrying Amount and Fair Value (1)
 Liabilities:      
  Interest rate swap agreements Other non-current liabilities ZAR 423,634 ZAR 20,441
  Interest rate swap agreements Other non-current liabilities COP 101,250,000 COP 5,356,377
         
         
 (1)The interest rate swap agreements are denominated in ZAR and COP and have an aggregate notional amount and fair value of $107.3 million and $5.4 million, respectively, as of December 31, 2012.
         
Schedule of interest rate swap agreements' impact on other comprehensive income
            
   Year Ended December 31, 2012
 Amount of Gain/(Loss) Recognized in OCI on Derivatives (Effective Portion) Location of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)  Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 $ (6,220) Interest expense $ (1,340) N/A N/A
            
   Year Ended December 31, 2011
 Amount of Gain/(Loss) Recognized in OCI on Derivatives (Effective Portion) Location of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)  Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 $ (228) Interest expense $ (2,205) N/A N/A
            
   Year Ended December 31, 2010
 Amount of Gain/(Loss) Recognized in OCI on Derivatives (Effective Portion) Location of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)  Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Location of Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 $ (8,798) Interest expense $ (18,294) N/A N/A
            
Schedule of other comprehensive (loss) income included in derivative financial instruments
         
 2012 2011 2010
Deferred loss on the settlement of the treasury rate lock, net of tax$ (3,827) $ (4,625) $ (3,354)
Deferred gain on the settlement of interest rate swap agreements entered into in connection with the Securitization, net of tax  -    202   497
Unrealized losses related to interest rate swap agreements, net of tax  (4,815)   -    (2,083)