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FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   $ 0 $ 12,393
Derivative Asset   683 458
Other Assets, Fair Value Disclosure $ 111 111 154
Assets, Fair Value Disclosure   794 13,005
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Preferred stock at end of period 111    
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments for contractual obligations   0 12,393
Derivative Asset   0 0
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure   0 12,393
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
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   683 458
Other Assets, Fair Value Disclosure 0 0 0
Assets, Fair Value Disclosure   683 458
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
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 111 111 154
Assets, Fair Value Disclosure   $ 111 $ 154
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Fair Value Adjustment (43)    
Preferred stock at end of period $ 111