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Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Period From October 2013 Through December 2013 [Member] | Sep. 30, 2013 Period From January 2014 Through December 2014 [Member] | Sep. 30, 2013 Reclassification out of Accumulated Other Comprehensive Income [Member] | Sep. 30, 2013 Interest Rate Swap [Member] | Sep. 30, 2012 Interest Rate Swap [Member] | Sep. 30, 2013 Interest Rate Swap [Member] | Sep. 30, 2012 Interest Rate Swap [Member] | Sep. 30, 2013 Forward Contracts [Member] | Sep. 30, 2013 Forward Contracts [Member] | Dec. 31, 2012 Forward Contracts [Member] | Sep. 30, 2013 Commodity Contract [Member] lb | Dec. 31, 2012 Commodity Contract [Member] lb | Sep. 30, 2013 Commodity Contract [Member] Period From October 2013 Through December 2013 [Member] lb | Sep. 30, 2013 Commodity Contract [Member] Period From January 2014 Through December 2014 [Member] lb | Sep. 30, 2013 Senior Notes [Member] | Dec. 31, 2012 Senior Notes [Member]
Secured long-term debt, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000 | $ 175,000
Fair value of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190,313 | 188,895
Gain (loss) on derivative instruments held for trading purposes, net | (655) |  | (97) |  |  |  |  |  |  |  |  | (489) |  | (404) |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivatives designated as cash flow hedging instruments |  |  |  |  | 12,125 | 45,000 |  |  |  |  |  | 57,125 | [1] | 57,125 | [1] | 36,500 | [1] |  |  |  |  |  |  |  |
Notional amount of derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  | 13,293 | [1] | 13,293 | [1] | 12,643 | [1] |  |  |  |  |  |  |  |
Fixed price commodity contracts (in pounds) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,937,000 | [1] | 2,436,000 | [1] | 763,000 | 1,174,000 |  |
Interest rate swap, notional amount |  |  |  |  |  |  |  | 45,000 |  | 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discription of variable rate basis of derivative |  |  |  |  |  |  |  |  |  | the Company pays a variable interest rate equal to the six-month London Interbank Offered Rate ("LIBOR") plus 7.2% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interenst rate |  |  |  |  |  |  |  | 7.20% |  | 7.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |
Increase (decrease) in interest expense |  |  |  |  |  |  |  | (222) | (241) | (644) | (634) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  | 9.50% |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedge gain reclassified to earnings | 5,513 | 589 | 16,187 | 1,037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount from cash flow hedge derivatives to be reclassified |  |  |  |  |  |  | $ 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding. The fixed price commodity contract 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 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 The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + 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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