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Restructuring and Asset Impairment Charges Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Joint Processing Venture [Member]	Sep. 30, 2013 Joint Processing Venture [Member]	Jun. 30, 2013 Joint Processing Venture [Member]	Jun. 30, 2013 Pension Plan Termination Effects [Member] Joint Processing Venture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost							$ 1,893	$ 1,261
Asset Impairment Charges	500	0	500	1,564	500		303
Severance Costs						$ 580

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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