Restructuring and Asset Impairment Charges Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Asset Impairment Charges	$ 1,564	$ 0
Joint Processing Venture [Member]
Restructuring Cost and Reserve [Line Items]
Number of Foreign Locations under Restructuring	1
Restructuring and Related Cost, Incurred Cost	1,893
Asset Impairment Charges	303
Pension Plan Termination Effects [Member] | Joint Processing Venture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 1,261