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FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   $ 12,514 $ 12,393
Derivative Asset   208 458
Other Assets, Fair Value Disclosure $ 124 124 154
Assets, Fair Value Disclosure   12,846 13,005
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period 154    
Preferred stock at end of period 124    
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   12,514 12,393
Derivative Asset   0 0
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure   12,514 12,393
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   208 458
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure   208 458
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   0 0
Other Assets, Fair Value Disclosure 154 124 154
Assets, Fair Value Disclosure   $ 124 $ 154
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at beginning of period 154    
Assets, Fair Value Adjustment (30)    
Preferred stock at end of period $ 124