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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

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