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Financial Instruments and Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Reclassification out of Accumulated Other Comprehensive Income [Member] | Jun. 30, 2013 Interest Rate Swap [Member] | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2013 Interest Rate Swap [Member] | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2013 Forward Contracts [Member] | Jun. 30, 2012 Forward Contracts [Member] | Dec. 31, 2012 Forward Contracts [Member] | Jun. 30, 2013 Forward Contracts [Member] Period From July 2013 Through December 2013 [Member] | Jun. 30, 2013 Forward Contracts [Member] Period From January 2014 Through December 2014 [Member] | Jun. 30, 2013 Commodity Contract [Member] lb | Dec. 31, 2012 Commodity Contract [Member] lb | Jun. 30, 2013 Commodity Contract [Member] Period From July 2013 Through December 2013 [Member] lb | Jun. 30, 2013 Commodity Contract [Member] Period From January 2014 Through December 2014 [Member] lb | Jun. 30, 2013 Senior Notes [Member] | Dec. 31, 2012 Senior Notes [Member]
Secured Long-term Debt, Noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000 | $ 175,000
Long-Term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,853 | 188,895
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net |  | 1,435 |  | 558 |  |  |  |  |  | (278) |  | 85 |  |  |  |  |  |  |  |  |  |  |  |
Derivatives Designated As Hedging Instruments Cash Flow Hedges Notional Amount |  |  |  |  |  |  |  |  |  | 69,250 | [1] |  | 36,500 | [1] | 24,250 | 45,000 |  |  |  |  |  |  |  |
Derivatives Not Designated As Hedging Instruments Notional Amount |  |  |  |  |  |  |  |  |  | 12,625 | [1] |  | 12,643 | [1] |  |  |  |  |  |  |  |  |  |
Fixed Price Commodity Contracts (in pounds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,827,000 | [1] | 2,436,000 | [1] | 1,653,000 | 1,174,000 |  |
Derivative Instruments in Hedges, at Fair Value, Net, Total |  |  |  |  |  | 45,000 |  | 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Variable Interest Rate |  |  |  |  |  | 7.20% |  | 7.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  | 9.50% |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase Decrease In Derivative Interest Expenses |  |  |  |  |  | 191 | 168 | 422 | 393 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 9.50% |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Gain Reclassified To Earnings | $ 6,391 | $ (5,298) | $ 10,674 | $ 448 | $ 538 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commodity notional amounts are in pounds.

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- Definition Aggregate notional amount of all derivatives designated as cash flow hedging instruments. + References No definition available. + Details
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- Definition Aggregate notional amount of all derivatives not designated as a hedging instrument. + References No definition available. + Details
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- Definition Quantity of fixed price commodity contracts. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the 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 net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 + 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 + 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 The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + 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 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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