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Acquisitions (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Oct. 24, 2011
Jun. 30, 2012
Terphane [Member]
Dec. 31, 2011
Terphane [Member]
Jun. 30, 2012
Terphane [Member]
Business Acquisition [Line Items]                  
Percentage of outstanding equity interests acquired           100.00%      
Total purchase price           $ 182,761,000      
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  
Sales 216,113,000   200,966,000 433,311,000 392,490,000   36,000,000   69,400,000
Net income $ 7,353,000   $ 5,703,000 $ 10,351,000 $ 12,371,000   $ 3,800,000   $ 6,100,000