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FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   $ 10,087 $ 9,840
Derivative Asset, Current   5,583 1,068
Other Assets, Fair Value Disclosure $ 250 250 250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure   (30) (43)
Assets, Fair Value Disclosure   15,890 11,115
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    
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   10,087 9,840
Derivative Asset, Current   0 0
Other Assets, Fair Value Disclosure 0 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure   0 0
Assets, Fair Value Disclosure   10,087 9,840
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    
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   0 0
Derivative Asset, Current   5,583 1,068
Other Assets, Fair Value Disclosure 0 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure   (30) (43)
Assets, Fair Value Disclosure   5,553 1,025
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    
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   0 0
Derivative Asset, Current   0 0
Other Assets, Fair Value Disclosure 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 at beginning of period 250    
Gain (Loss) on Investments 0    
Preferred stock at end of period $ 250