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DERIVATIVE INSTRUMENTS (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Mar. 31, 2013
Interest Rate Swaps [Member]
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Jun. 30, 2013
Interest Rate Swaps [Member]
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Jun. 30, 2012
Interest Rate Swaps [Member]
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Dec. 31, 2012
Interest Rate Swaps [Member]
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Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Commodity Financial Instruments [Member]
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Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Commodity Financial Instruments [Member]
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Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Commodity Financial Instruments [Member]
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Jun. 30, 2012
Not Designated as Hedging Instrument [Member]
Commodity Financial Instruments [Member]
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| DERIVATIVE INSTRUMENTS [Abstract] | ||||||||||||||||
| Feedstock and natural gas usage to operating expenses (in hundredths) | 79.70% | 82.90% | ||||||||||||||
| Monthly feedstock requirements hedged, Maximum (in hundredths) | 40.00% | 40.00% | ||||||||||||||
| Derivatives, Fair Value [Line Items] | ||||||||||||||||
| Unrealized loss | $ 0 | $ (2,206,000) | [1] | $ 0 | $ (2,815,000) | $ 0 | $ (2,283,000) | |||||||||
| Realized gain | 0 | 213,000 | 0 | 504,000 | ||||||||||||
| Net gain (loss) | 0 | (2,602,000) | 0 | (1,779,000) | ||||||||||||
| Fair value of financial contracts - asset (liability) | 0 | 0 | 0 | |||||||||||||
| Realized and unrealized gains (losses) as a percentage of cost of sales and processing (in hundredths) | 0.00% | 4.90% | 0.00% | 1.70% | ||||||||||||
| Prepaid derivative settlement | 0 | 1,500,000 | [1] | |||||||||||||
| Term loan in pay fixed, receive variable interest rate swap | 10,000,000 | |||||||||||||||
| Term loan secured by plant, pipeline and equipment | 14,000,000 | |||||||||||||||
| Notional amount | 4,750,000 | |||||||||||||||
| Derivative, variable interest rate (in hundredths) | 5.83% | |||||||||||||||
| Cumulative loss | (696,000) | (1,021,000) | ||||||||||||||
| Deferred tax benefit | 243,000 | 347,000 | ||||||||||||||
| Net cumulative loss | 127,000 | 74,000 | [1] | (453,000) | (674,000) | |||||||||||
| Interest expense reclassified from other comprehensive loss | 80,000 | 94,000 | ||||||||||||||
| Fair value of interest rate swap - liability | 696,000 | 893,000 | ||||||||||||||
| Cash flow hedge gain (loss) to be reclassified within twelve months | $ 272,000 | |||||||||||||||
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