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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Property, Plant, and Equipment, Fair Value Disclosure $ 0   $ 0
Mining asset impairment 23,242 0  
Fair Value, Measurements, Recurring [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations 9,567   8,723
Other Assets, Fair Value Disclosure 250   250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (60)   (126)
Assets, Fair Value Disclosure 9,757   8,847
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period     250
Preferred stock at end of period 250   250
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations 9,567   8,723
Other Assets, Fair Value Disclosure 0   0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0   0
Assets, Fair Value Disclosure 9,567   8,723
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period     0
Preferred stock at end of period 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations 0   0
Other Assets, Fair Value Disclosure 0   0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (60)   (126)
Assets, Fair Value Disclosure (60)   (126)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period     0
Preferred stock at end of period 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations 0   0
Other Assets, Fair Value Disclosure 250    
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0   0
Assets, Fair Value Disclosure 250   250
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period 250    
Gain (Loss) on Investments 0    
Preferred stock at end of period $ 250