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Guarantees (Tables)
6 Months Ended
Sep. 30, 2013
Guarantees [Abstract]  
Summary of gaurantees and associated fair values
The following table summarizes amounts guaranteed and the fair value of those guarantees:
 
September 30, 2013
 
September 30, 2012
 
March 31, 2013
Amounts guaranteed (not to exceed)
$
126,608

 
$
117,928

 
$
125,623

Amounts outstanding under guarantee
121,634

 
112,227

 
98,689

Fair value of guarantees
6,023

 
9,489

 
6,367