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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Asset, Current $ 988 $ 66
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for contractual obligations 9,668 9,480
Derivative Asset, Current 988 66
Preferred stock 181 250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 (8)
Assets, Fair Value Disclosure 10,837 9,788
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock 181 250
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 9,668 9,480
Derivative Asset, Current 0 0
Preferred stock 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 9,668 9,480
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]    
Investments for contractual obligations 0 0
Derivative Asset, Current 988 66
Preferred stock 0 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 (8)
Assets, Fair Value Disclosure 988 58
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]    
Investments for contractual obligations 0 0
Derivative Asset, Current 0 0
Preferred stock 181 250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 181 250
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock 181 250
Gain (Loss) on Investments $ (69) $ 0