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FAIR VALUE MEASUREMENTS (Textuals) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
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Laramie, Wyoming and Greeley, Colorado [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Fair value of assets held for sale | $ 4,102 |
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Enid, Oklahoma [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Fair value of assets held for sale | $ 867 |