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DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2013 MMBTU | Jun. 25, 2011 | Dec. 28, 2013 Natural Gas Price Swap MMBTU | Dec. 29, 2012 Natural Gas Price Swap MMBTU | Jun. 08, 2011 Interest rate contract Cash flow hedging | Dec. 31, 2011 Interest rate contract Cash flow hedging | Jun. 25, 2011 Interest rate contract Cash flow hedging | Dec. 28, 2013 Forward contracts
Derivative Instrument |  |  |  |  |  |  |  |
Annual consolidated natural gas purchase requirements (in MMBtu) | 1,113,800 |  |  |  |  |  |  |
Quantities of natural gas (in MMBtu) |  |  | 120,000 | 70,000 |  |  |  |
Unrealized gain |  |  | $ 73 | $ 3 |  |  |  | $ 475
Aggregate principal amount |  | 150,000 |  |  |  |  |  |
Notional amount of derivative instrument |  |  |  |  |  |  | 130,000 | 28,032
Payment to counterparty to settle the derivative contract |  |  |  |  | 3,568 |  |  |
Loss on interest rate cash flow hedge derivative, recorded in accumulated other comprehensive income |  |  |  |  |  | $ 3,568 |  |

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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Definition The aggregate net gain (loss) on price risk derivatives included in earnings in the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges, including amortization cost. + References No definition available. + Details
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