Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013 facilities
Restructuring Cost and Reserve [Line Items]
Number Of Plants Consolidated in Restructuring		5
Restructuring and Related Cost, Expected Cost	$ 7,000	$ 10,000
Restructuring charges		2,982	[1]
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		3,500
Restructuring charges		1,398	[1]
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		2,500
Restructuring charges		0
Plant Consolidations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		1,600
Restructuring charges		859	[1]
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		42	[1]
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		2,400
Restructuring charges		$ 725

[1] Costs associated with the write-off of inventory are included in cost of materials in the condensed consolidated statements of operations and comprehensive loss.