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Loss on extinguishment of debt (Tables)
 12 Months Ended
Mar. 31, 2014
Loss on extinguishment of debt  
Schedule of loss on extinguishment of debt

 

 
   Year ended March 31,  
 
   2014   2013   2012  

Premiums paid on redemption / repurchase of

                    

8.875% Senior Notes

   $ 28,572   $ —   $ 1,770  

Deferred charges written off

     8,125     599     3,091  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 36,697   $ 599   $ 4,861  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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