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Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 515,742	$ 515,407
Other assets	$ 33,346	$ 34,853

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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