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Income taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income taxes  
Schedule of components of income tax expenses (benefit)

 

 

 
  Three months ended
March 31,
 
 
  2012   2011  

Current income tax expense (benefit)

  $ 1,385   $ (488 )

Deferred tax expense (benefit)

    (17,676 )   2,011  
           

Total income tax expense (benefit)

  $ (16,291 ) $ 1,523