Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 facilities
Restructuring Cost and Reserve [Line Items]
Estimated future restructuring costs	$ 1,000	$ 1,000
Number Of Plants Consolidated in Restructuring		5
Restructuring charges	6,072	9,054	[1]
Employee Termination and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	816	2,214	[1]
Lease Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,830	1,830
Moving Costs Associated with Plant Consolidations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,674	3,459	[1]
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	273	315	[1]
Inventory Writedowns [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 479	$ 1,236	[1]

[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. All other costs are recorded to the restructuring charges line item within the condensed consolidated statements of operations and comprehensive loss as they are incurred.