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Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified | 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 | Dec. 31, 2012 | Sep. 30, 2013 Interest rate swaps [Member] DerivativeContract | Oct. 01, 2012 Interest rate swaps [Member] | Sep. 30, 2013 Commodity contracts [Member] | Sep. 30, 2012 Commodity forward contract one [Member] | Dec. 31, 2012 Commodity forward contract two [Member] | Sep. 30, 2013 Commodity Forward Contract Three [Member] | Sep. 30, 2013 Commodity forward contract Four [Member] | Sep. 30, 2013 Commodity forward contract Five [Member] | Sep. 30, 2013 Commodity Forward Contract Six [Member] | Sep. 30, 2013 Foreign Exchange Contract [Member] DerivativeContract | Dec. 31, 2012 Foreign Exchange Contract [Member] DerivativeContract | Sep. 30, 2012 Foreign Exchange Contract [Member] DerivativeContract | Sep. 30, 2013 Derivatives not designated as hedging instruments [Member] | Dec. 31, 2012 Derivatives not designated as hedging instruments [Member] | Sep. 30, 2013 Derivatives not designated as hedging instruments [Member] Interest rate swaps [Member] | Dec. 31, 2012 Derivatives not designated as hedging instruments [Member] Interest rate swaps [Member] | Sep. 30, 2013 Derivatives not designated as hedging instruments [Member] Commodity contracts [Member] | Dec. 31, 2012 Derivatives not designated as hedging instruments [Member] Commodity contracts [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of contracts, maximum (in months) |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |
Number of outstanding contracts |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  | $ 100,000 |  | $ 1,898 | $ 3,472 | $ 2,677 | $ 2,636 | $ 4,033 | $ 2,169 |  |  |  |  |  |  |  |  |
Total gains or losses recognized | 578 | 68 | (540) | 322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed rate (in hundredths) |  |  |  |  |  |  | 2.22% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivatives liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (28) | (2,862) | 0 | (2,973) | (28) | 111
Fair value of derivative contracts excluding impact of credit risk | (28) |  | (28) |  | (2,936) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity forward contracts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade Date |  |  |  |  |  |  |  |  | May 18, 2012 | Oct. 29, 2012 | Feb. 26, 2013 | Mar. 01, 2013 | Apr. 15, 2013 | Jun. 21, 2013 |  |  |  |  |  |  |  |  |
Effective date |  |  |  |  |  |  |  |  | Jul. 01, 2012 | Jan. 01, 2013 | Mar. 01, 2013 | Mar. 01, 2013 | May 01, 2013 | Oct. 01, 2013 |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | $ 100,000 |  | $ 1,898 | $ 3,472 | $ 2,677 | $ 2,636 | $ 4,033 | $ 2,169 |  |  |  |  |  |  |  |  |
Termination Date |  |  |  |  |  |  |  |  | Dec. 31, 2012 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Jun. 30, 2014 |  |  |  |  |  |  |  |  |

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- Definition Fair value derivative contracts excluding impact of credit risk. + References No definition available. + Details
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- Definition Date the derivative contract become effective, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + 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=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: 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=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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