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Accrued liabilities
12 Months Ended
Mar. 31, 2013
Payables and Accruals [Abstract]  
Accrued liabilities
Accrued liabilities
 
 
March 31, 2013

 
March 31, 2012

Accrued interest payable
 
$
9,863

 
$
9,866

Payroll liabilities
 
19,040

 
15,228

Liabilities related to equipment leases
 
687

 
4,238

Income and other taxes payable
 
2,892

 
7,463

 
 
$
32,482

 
$
36,795