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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Current $ 1,068 $ 0  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]      
Property, Plant, and Equipment, Fair Value Disclosure 40,346    
Mining asset impairment 23,242 0 $ 0
Noncash goodwill impairment charge 36,571 0 0
Fair Value, Measurements, Recurring [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations 9,840 8,723  
Derivative Asset, Current 1,068 0  
Preferred stock 250 250  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (43) (126)  
Assets, Fair Value Disclosure 11,115 8,847  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock 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 9,840 8,723  
Derivative Asset, Current 0 0  
Preferred stock 0 0  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0  
Assets, Fair Value Disclosure 9,840 8,723  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock 0 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Current 1,068 0  
Preferred stock 0 0  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (43) (126)  
Assets, Fair Value Disclosure 1,025 (126)  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock 0 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Current 0 0  
Preferred stock 250 250 250
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 250 250 $ 250
Gain (Loss) on Investments $ 0 $ 0