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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative financial instruments $ 458 $ 988
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for deferred compensation 12,393 9,668
Derivative financial instruments 458 988
Preferred stock 154 181
Assets, Fair Value Disclosure 13,005 10,837
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock 154 181
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments for deferred compensation 12,393 9,668
Derivative financial instruments 0 0
Preferred stock 0 0
Assets, Fair Value Disclosure 12,393 9,668
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 deferred compensation 0 0
Derivative financial instruments 458 988
Preferred stock 0 0
Assets, Fair Value Disclosure 458 988
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 deferred compensation 0 0
Derivative financial instruments 0 0
Preferred stock 154 181
Assets, Fair Value Disclosure 154 181
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Preferred stock 154 181
Total unrealized losses $ (27) $ (69)