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Changes in Non-Cash Working Capital
 12 Months Ended
Mar. 31, 2014
Changes in Non-Cash Working Capital  
Changes in Non-Cash Working Capital

20. Changes in Non-Cash Working Capital

        Changes in non-cash working capital include:

 
   Year ended March 31,  
 
   2014   2013   2012  

Margin deposits

   $ (14,137 ) $ (39,174 ) $ 99,804  

Trade receivables

     (3,383 )   (286 )   (45 )

Accrued receivables

     (44,459 )   (40,203 )   9,938  

Natural gas inventory

     3,676     125,042     (120,563 )

Prepaid expenses and other current assets

     358     (1,527 )   2,669  

Other assets

     (807 )   (1,105 )   (1,637 )

Trade payables

     (149 )   645     (316 )

Accrued liabilities

     68,108     8,456     (53,036 )

Income taxes

     8     (693 )   (579 )

Deferred revenue

     5,468     (10,667 )   6,498  

Due from related party

     (10 )   1,164     732  

Other long-term liabilities

     360     381     115  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net changes in non-cash working capital

   $ 15,033   $ 42,033   $ (56,420 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

        During the year ended March 31, 2013, changes in non-cash working capital include the receipt of proceeds of $32.6 million (March 31, 2014—$ nil; March 31, 2012—$ nil) from sales of cushion. The Company included such proceeds in cash flows from operations since the predominant source of cash flows for natural gas purchases and sales are operating in nature.