Restructuring and Impairment Charges (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended	3 Months Ended				6 Months Ended				3 Months Ended			6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 High Performance Foams [Member] Employee Severance [Member]		Jun. 30, 2012 High Performance Foams [Member] Employee Severance [Member]		Jun. 30, 2013 High Performance Foams [Member] Employee Severance [Member]		Jun. 30, 2012 High Performance Foams [Member] Employee Severance [Member]		Jun. 30, 2013 Composite Material Division [Member]	Dec. 31, 2012 Composite Material Division [Member]	Jun. 30, 2012 Composite Material Division [Member]	Jun. 30, 2013 Composite Material Division [Member]	Jun. 30, 2012 Composite Material Division [Member]	Dec. 31, 2011 Composite Material Division [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member] Lease Contract Termination [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member] Employee Severance [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member] Asset Impairments [Member]	Jun. 30, 2012 Bremen, Germany [Member] High Performance Foams [Member] Equipment Removal and Transportation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (700,000)	$ 2,300,000	$ 1,600,000	$ 1,253,000	[1]	$ 670,000	[1]	$ 1,253,000	[1]	$ 3,088,000	[1]							$ 1,500,000	$ 3,100,000	$ 900,000	$ 800,000	$ 400,000	$ 300,000
Net sales associated with the discontinued operations			$ (100,000)									$ 100,000	$ 5,300,000	$ 1,400,000	$ 200,000	$ 2,600,000	$ 4,800,000

[1] For the three and six month periods ended June 30, 2013, this includes a pension curtailment charge of $1.5 million. See Note 8 - "Pension Benefit and Other Post Retirement Plans" for further information. For the three and six month periods ended June 30, 2012, this includes an estimated $2.3 million charge recorded in the first quarter of 2012, offset by a favorable adjustment of $0.7 million recorded in the second quarter of 2012. This net charge of $1.6 million, for 2012, was related to the early retirement program implemented in the first quarter of 2012.