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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 |

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