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DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Forward Contracts [Member] | Dec. 31, 2012 Forward Contracts [Member] | Dec. 31, 2013 Forward Contracts Sell [Member] | Dec. 31, 2012 Forward Contracts Sell [Member] | Dec. 31, 2011 Variable Interest Rate Swaps $75M [Member] | Jan. 01, 2009 Variable Interest Rate Swaps $75M [Member] | Dec. 31, 2011 Fixed Interest Rate Swap $75M [Member] | Dec. 31, 2013 Variable Interest Rate Swaps $125M [Member] | Oct. 31, 2011 Variable Interest Rate Swaps $125M [Member] | Dec. 31, 2013 Fixed Interest Rate Swaps $125M [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 75.0 |  | $ 75.0 | $ 125.0 |  | $ 125.0
Deferred gain recognized |  |  |  |  |  |  |  |  |  | 7.9 |  | 6.1 | 11.0 |
Cash flow hedges [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Amount with major counterparty |  | 54.0 |  |  |  |  |  |  |  |  |  |  |  |
Commodity forward contracts with Citibank |  | 24.0 |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  | 0.7 |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount on Discontinuation of Interest Rate Fair Value Hedge |  | 73.1 |  | 7.7 |  |  |  |  |  |  |  |  |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | 2.2 | 1.2 |  | 0.2 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Redemption of Debt Instrument | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Credit Risk Related Contingent Features [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral provided to us by counterparties |  | $ 0 | $ 0.1 |  |  |  |  |  |  |  |  |  |  |

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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 Amounts recognized in other current assets or (accrued liabilities) for cash collateral provided to us by counterparties + References No definition available. + Details
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- Definition Commodity forward contracts with Citibank, a major counterparty. + References No definition available. + Details
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- Definition Commodity forward contracts with Wells Fargo, a major counterparty. + References No definition available. + Details
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- Definition The amount of net gain (loss) reclassified into earnings when interest rate cash flow hedge is discontinued because of the redemption of the hedged item. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: 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 + Details
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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 35 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6439857&loc=d3e75592-113984 + Details
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