Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 649	$ 645	$ 565
Additions to Reserve	210	100	241
Write-Offs Charged Against Reserves	(430)	(917)	(1,083)
Recoveries	437	821	922
Balance at End of Period	866	649	645
Valuation allowance on deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	4,090	162	12
Additions to Reserve	10,052	3,928	150
Write-Offs Charged Against Reserves	0	0	0
Recoveries	0	0	0
Balance at End of Period	$ 14,142	$ 4,090	$ 162