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Financial Instruments and Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 pounds | Dec. 31, 2011 pounds | Dec. 31, 2010 | Dec. 31, 2012 Interest Rate Swap [Member] | Dec. 31, 2011 Interest Rate Swap [Member] | Dec. 31, 2010 Interest Rate Swap [Member] | Dec. 31, 2012 Forward Contracts [Member] | Dec. 31, 2011 Forward Contracts [Member] | Dec. 31, 2012 Period From January 2013 To December 2013 [Member] | Dec. 31, 2012 Senior Notes [Member] | Dec. 31, 2011 Senior Notes [Member] | Oct. 04, 2010 Senior Notes [Member]
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  |  |  | $ 175,000 | $ 175,000 | $ 175,000
Long-term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  | 188,895 | 179,156 |
Notional amount of derivatives not designated as hedging instruments |  |  |  |  |  |  | 12,643 | [1] | 25,894 | [1] |  |  |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net |  |  |  |  |  |  | 492 |  | 225 |  |  |  |  |
Notional Amount of Cash Flow Hedge Instruments |  |  |  |  |  |  | 36,500 | [1] | 55,000 | [1] | 36,500 |  |  |
Fixed Price Commodity Contracts (in pounds) | 2,436 | 6,500 |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount of Interest Rate Fair Value Hedge Derivatives |  |  |  | 45,000 |  |  |  |  |  |  |  |  |  |
Derivative, Variable Interest Rate |  |  |  | 7.19% |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |
Increase Decrease In Derivative Interest Expenses |  |  |  | 736 | 473 | 200 |  |  |  |  |  |  |  |
Fair Value Adjustment Of Goodwill |  | 4,945 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  | 9.50%
Cash Flow Hedge Gain Reclassified to Earnings | 2,140 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Loss, before Tax |  |  | $ 240 |  |  |  |  |  |  |  |  |  |  |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding.

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- Definition Quantity of fixed price commodity contracts. + References No definition available. + Details
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- Definition The amount of gains on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 15, 20, 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624186-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 02-3 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Aggregate notional amount of all derivatives designated as cash flow hedging instruments. 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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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Aggregate notional amount of all derivatives not designated as a hedging instrument. 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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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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