Certain Financial Statement Information Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Schedule of Accounts receivable
Accounts receivable	$ 29,281	$ 25,278
Less: allowance for bad debts	(481)	(703)
Accounts receivable, net	$ 28,800	$ 24,575	[1]

[1] Amounts have been derived from the March 31, 2013 audited consolidated financial statements.