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Debt Narrative - Senior Secured Notes and Revolving Credit Facility - Food Packaging (Details) (Food Packaging Segment [Member], USD $) | 3 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  | 3 Months Ended |
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Mar. 31, 2013 Secured Debt [Member] Viskase Notes Indenture [Member] | May 31, 2010 Secured Debt [Member] Viskase Notes Indenture [Member] | Dec. 31, 2009 Secured Debt [Member] Viskase Senior Secured Notes due 2018 [Member] | Nov. 30, 2007 Secured Debt [Member] Revolving Credit Facility [Member] | Mar. 31, 2013 Secured Debt [Member] Revolving Credit Facility [Member] | Dec. 31, 2012 Secured Debt [Member] Revolving Credit Facility [Member] | Mar. 31, 2013 Secured Debt [Member] Letter of Credit [Member] | Dec. 31, 2012 Secured Debt [Member] Letter of Credit [Member] | Mar. 31, 2013 Unsecured Debt [Member] Line of Credit [Member] | Dec. 31, 2012 Unsecured Debt [Member] Line of Credit [Member] | Mar. 31, 2013 Debt repurchase date range, Prior to January 15, 2014 [Member] Secured Debt [Member] Viskase Notes Indenture [Member] | Nov. 30, 2007 Maximum [Member] Secured Debt [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  | $ 40,000,000 | $ 175,000,000 |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  | 9.875% | 9.875% |  |  |  |  |  |  |  |  |
Redemption percentage of aggregate principal amount authorized to be redeemed at higher percenatge of principal amount | 35.00% |  |  |  |  |  |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  |  |  |  |  |  | 109.875% |
Percentage of aggregate principal amount required to remain outstanding if debt redeemed at higher percenatge of principal amount | 65.00% |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  | 25,000,000 |  |  |  |  | 8,000,000 |  |  |
Percentage spread on debt |  |  |  |  | 2.00% |  |  |  |  |  |  | 2.50%
Debt Instrument, Interest Rate Floor |  |  |  | 3.00% |  |  |  |  |  |  |  |
Revolving credit facility unused line fee |  |  |  | 0.375% |  |  |  |  |  |  |  |
Line of credit facility, outstanding borowings |  |  |  |  | 0 | 0 |  |  | 0 | 0 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |  |

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