Goodwill and Other Intangibles Goodwill and Intangible Asset Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	$ 2,794	[1]	$ 2,794	[1]	$ 2,794	[1]
Gross balance					60,154
Amortizable Intangibles, Accumulated amortization					(18,949)
Net balance	35,865		41,205
Additions	976		821
Impairment of amortizable intangibles			(357)
Amortizable Intangibles, Amortization expense	(5,370)		(5,804)		(5,094)
Amortizable Intangibles, Net	28,677
Net balance	31,471		35,865		41,205
Other Regions [Member]
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	1,592		1,592		1,592
Value Added Services [Member]
Goodwill and Intangible Assets [Line Items]
Unamortizable Goodwill	1,202		1,202		1,202
Customer Relationships Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2013	12 years
Amortizable Intangibles, Gross carrying amount					33,700
Amortizable Intangibles, Accumulated amortization					(9,899)
Amortizable Intangibles, Net	22,116		23,801
Additions	0		0
Amortizable Intangibles, Amortization expense	(1,685)		(1,685)
Amortizable Intangibles, Net	20,431		22,116
Production and Supply Contract Intangibles [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2013	3 years
Amortizable Intangibles, Gross carrying amount					7,893
Amortizable Intangibles, Accumulated amortization					(1,948)
Amortizable Intangibles, Net	4,850		5,945
Additions	0		0
Amortizable Intangibles, Amortization expense	(614)		(1,095)
Amortizable Intangibles, Net	4,236		4,850
Internally Developed Software Intangible [Member]
Goodwill and Intangible Assets [Line Items]
Weighted average remaining useful life in years as of March 31, 2013	1 year
Amortizable Intangibles, Gross carrying amount					15,767
Amortizable Intangibles, Accumulated amortization					(7,102)
Amortizable Intangibles, Net	6,105		8,665
Additions	976		821
Impairment of amortizable intangibles			(357)
Amortizable Intangibles, Amortization expense	(3,071)		(3,024)
Amortizable Intangibles, Net	$ 4,010	[2]	$ 6,105

[1] **For the year ended March 31, 2013, 2012 and 2011, the warrants were not assumed exercised because the exercise price was more than the average price for the peri

[2] Estimated amortization expense for the internally developed software is based on costs accumulated as of March 31, 2013. These estimates will change as new costs are incurred and until the software is placed into service in all locations.