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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual) | 1 Months Ended | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |
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Feb. 28, 2011 USD ($) | Sep. 30, 2008 USD ($) | Apr. 30, 2008 USD ($) | Dec. 31, 2011 USD ($) lb MMBTU | Dec. 31, 2010 USD ($) lb MMBTU | Dec. 30, 1999 | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 EUR (€) | Dec. 31, 2009 USD ($) | Dec. 31, 1999 USD ($) | Dec. 31, 2011 Secured Term Loan due 2012 [Member] USD ($) | Dec. 31, 2010 Other debt [Member] | Dec. 31, 2008 Interest Rate Swap [Member] USD ($) | Dec. 31, 2010 Carbon Credits [Member] t
Derivative Financial Instruments and Carbon Credit Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts at cost basis |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |
Carbon credits subject to contractual obligations |  |  |  |  |  |  |  |  |  |  |  |  |  | 198,000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  | 5.15% | 6.00% |  |
Debt instrument principal amount |  |  |  |  |  |  |  |  |  |  | 24,100,000 |  |  |
Variable interest rate, Minimum |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Derivatives, Hedges, Financial Instruments and Carbon Credits (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts Weighted average exchange rate |  |  |  | 0.00 | 1.26 |  |  |  |  |  |  |  |  |
Contractual weighted average pay rate |  |  |  | 3.27% |  |  |  |  |  |  |  |  |  |
Estimated market weighted average receive rate |  |  |  | 0.99% |  |  |  |  |  |  |  |  |  |
Carbon credit fair value per unit |  |  |  | 3.15 | 3.25 |  |  |  |  |  |  |  |  |
Carbon credit lower range of ask or bid price |  |  |  | 1.00 | 3.00 |  |  |  |  |  |  |  |  |
Carbon credit higher range of ask or bid price |  |  |  | 3.00 | 5.00 |  |  |  |  |  |  |  |  |
Future or forward copper contract period |  |  |  | May 2012 | May 2011 |  |  |  |  |  |  |  |  |
Derivative future or forward contract in Pounds |  |  |  | 375,000 | 750,000 |  |  |  |  |  |  |  |  |
Weighted average cost per pound of future or forward copper contract |  |  |  | 3.42 | 3.75 |  |  |  |  |  |  |  |  |
Weighted average cost per MMBtu of future or forward natural gas contracts |  |  |  | 0 | 4.10 |  |  |  |  |  |  |  |  |
Derivative future or forward gas contract in MMBtu |  |  |  | 0 | 800,000 |  |  |  |  |  |  |  |  |
Foreign Exchange contract payment |  |  |  |  |  |  | 0 | 783,000 |  |  |  |  |  |
Foreign Exchange contracts receipt |  |  |  | 0 |  |  |  | 110,000 |  |  |  |  |  |
The month foreign exchange contract receipt period ends |  |  |  |  | June 2011 |  |  |  |  |  |  |  |  |
The month foreign exchange contract payment period ends |  |  |  |  | March 2011 |  |  |  |  |  |  |  |  |
Interest rate contracts fixed rate description | fixed three-month LIBOR rate of 3.23% on a declining balance | LIBOR rate of 3.595% on $25 million | Fixed three-month LIBOR rate of 3.24% on $25 million |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts LIBOR rate |  | 3.595% | 3.24% |  |  |  |  |  |  |  |  |  |  |
Notional amount of Interest rate contracts |  | 25,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Maturity period interest rate contract held |  |  |  | April, 2012 |  |  |  |  |  |  |  |  |  |
Basis for estimated fair value of secured term loan |  |  |  |  | LIBOR rates plus 6% |  |  |  |  |  |  |  |  |
Initial lease term of long-term lease agreement |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Termination cost of forward agreement |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |
Amortization of a cash flow hedge |  |  |  | 0 | 0 |  |  |  | 120,000 |  |  |  |  |
Interest rate swap | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate | 3.23% |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount of Interest Rate Derivatives | 23,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap declining balance ending balance | 18,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
The month future or forward natural gas contract period ends |  |  |  |  | February 2011 |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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