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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2012
Terphane [Member]
Dec. 31, 2011
Terphane [Member]
Oct. 24, 2011
Terphane [Member]
Mar. 31, 2013
AACOA [Member]
Oct. 01, 2012
AACOA [Member]
Business Acquisition [Line Items]              
Percentage of outstanding equity interests acquired         100.00%   100.00%
Total purchase price     $ 182,700,000       $ 54,625,000
Post-closing adjustment paid     3,300,000        
Available cash used to fund purchase price       57,700,000      
Financing used to fund purchase price       125,000,000      
Financing used to fund purchase price from existing credit facility             350,000,000
Sales 241,526,000 216,643,000       22,200,000  
Net income $ 4,277,000 $ 2,998,000       $ 600,000