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Acquisitions (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 Terphane [Member] | Dec. 31, 2011 Terphane [Member] | Oct. 24, 2011 Terphane [Member] | Jun. 30, 2013 AACOA [Member] | Jun. 30, 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 |  |  |  |  | $ 54,065,000
Cash received from seller |  |  |  |  |  |  |  | 600,000 | 600,000 |
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 | 243,530,000 | 215,859,000 | 485,056,000 | 432,502,000 |  |  |  | 22,500,000 | 44,700,000 |
Net income | $ 1,290,000 | $ 7,353,000 | $ 5,567,000 | $ 10,351,000 |  |  |  | $ 700,000 | $ 1,300,000 |

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