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Significant Accounting Policies, Derivative Instruments (Details) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2011 Interest rate swaps [Member] Contract | Dec. 31, 2010 Interest rate swaps [Member] Contract | Dec. 31, 2013 Interest rate swaps [Member] USD ($) Contract | Dec. 31, 2012 Interest rate swaps [Member] USD ($) Contract | Dec. 31, 2013 Defined Benefit Pension Plans [Member] USD ($) | Dec. 31, 2012 Defined Benefit Pension Plans [Member] USD ($) | Dec. 31, 2013 Commodity contracts [Member] USD ($) | Dec. 31, 2012 Commodity contracts [Member] USD ($) | Dec. 31, 2011 Commodity contracts [Member] USD ($) | Dec. 31, 2011 Commodity forward contract one [Member] USD ($) | Dec. 31, 2011 Commodity forward contract two [Member] USD ($) | Dec. 31, 2012 Commodity Forward Contract Three [Member] USD ($) | Dec. 31, 2013 Commodity forward contract Four [Member] USD ($) | Dec. 31, 2013 Interest rate swap one [Member] USD ($) | Dec. 31, 2011 Interest rate swap one [Member] USD ($) | Dec. 31, 2010 Interest rate swap one [Member] USD ($) | Dec. 31, 2013 Interest rate swap two [Member] USD ($) | Dec. 31, 2011 Interest rate swap two [Member] USD ($) | Dec. 31, 2010 Interest rate swap two [Member] USD ($) | Dec. 31, 2013 Foreign Currencies [Member] USD ($) | Dec. 31, 2013 Foreign Currencies [Member] GBP (£) | Dec. 31, 2013 Interest expense [Member] Interest rate swaps [Member] USD ($) | Dec. 31, 2012 Interest expense [Member] Interest rate swaps [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of contracts, maximum |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding contracts |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 200,000 | $ 300,000 |  |  |  |  |  |  |  | $ 4,533 | $ 1,935 | $ 3,472 | $ 2,169 | $ 100,000 | $ 200,000 | $ 200,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 650 | £ 4,000 |  |
Number of new contracts entered |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) recognized on derivative contract |  |  |  |  |  |  |  |  |  |  |  | (605) | 386 | (861) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed LIBOR rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.737% | 1.905% | 1.73% | 1.742% | 2.22% | 1.025% |  |  |  |
Derivative Instruments, Gain (Loss) Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  | (1,108) | [1] | (909) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,490) | (2,177)
Tax benefit |  |  |  |  |  |  |  | 414 | [1] | 356 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109 | 95
Net of tax | 2,381 | 2,082 | 0 |  |  |  |  | (694) | [1] | (553) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,381) | (2,082)
Outstanding commodity forward contracts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 19, 2011 | Sep. 28, 2011 | Oct. 29, 2012 | Jun. 21, 2013 | Oct. 23, 2013 | Apr. 01, 2011 | Jan. 21, 2010 | Oct. 23, 2013 | Apr. 01, 2011 | Jun. 29, 2010 |  |  |  |
Effective date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2011 | Oct. 01, 2011 | Jan. 01, 2013 | Oct. 01, 2013 | Jul. 01, 2014 | Jul. 01, 2012 | Jul. 01, 2010 | Jul. 01, 2014 | Oct. 01, 2012 | Oct. 01, 2010 |  |  |  |
Notional Amount |  |  |  |  |  | $ 200,000 | $ 300,000 |  |  |  |  |  |  |  | $ 4,533 | $ 1,935 | $ 3,472 | $ 2,169 | $ 100,000 | $ 200,000 | $ 200,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 650 | £ 4,000 |  |
Termination Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2013 | Jun. 30, 2014 | Jul. 01, 2018 | Jul. 01, 2013 | Jul. 01, 2012 | Jul. 01, 2018 | Oct. 01, 2013 | Oct. 01, 2012 |  |  |  |
[1] | These actuarial losses are included in the computation of net periodic pension cost. See Note 9 – Benefit Plans for additional 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 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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