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Supplemental Financial Information (Tables)
 12 Months Ended
Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
A summary of additions and deductions related to the allowance for doubtful accounts for the years ended March 31, 2013, 2012 and 2011 follows (amounts in thousands):
 
Balance at Beginning
of Year
 
Charged to
Costs and Expenses
 
 
Deductions (1)
 
Balance at
End of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
2013
$
2,602

 
$
516

 
$
(354
)
 
$
2,764

2012
2,838

 
7

 
(243
)
 
2,602

2011
3,109

 
31

 
(302
)
 
2,838