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Acquisitions (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Oct. 24, 2011 | Sep. 30, 2012 Terphane [Member] | Mar. 31, 2012 Terphane [Member] | Dec. 31, 2011 Terphane [Member] | Sep. 30, 2012 Terphane [Member] | Oct. 24, 2011 Terphane [Member] | Oct. 01, 2012 AACOA [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding equity interests acquired |  |  |  |  |  |  |  |  |  | 100.00% | 100.00%
Total purchase price |  |  |  |  | $ 182,761,000 |  |  |  |  |  | $ 50,800,000
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 | 218,809,000 | 202,590,000 | 652,120,000 | 595,080,000 |  | 36,000,000 |  |  | 105,400,000 |  |
Net income | $ 7,427,000 | $ 12,736,000 | $ 17,778,000 | $ 25,107,000 |  | $ 5,700,000 |  |  | $ 11,800,000 |  |

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