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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Accumulated other comprehensive income loss $ (4,015) $ 2,957
Interest rate swap agreements    
Derivative [Line Items]    
Interest rate swap agreement, current liability $ 1,163 $ 3,888
Not Designated as Hedging Instrument | Foreign Exchange Forward    
Derivative [Line Items]    
Derivative term (in years) 1 year  
Net gain $ 2,100  
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Forward    
Derivative [Line Items]    
Derivative term (in years) 2 years  
Amount reclassified into income $ 400  
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap agreements    
Derivative [Line Items]    
Interest rate swap agreement, current liability 1,200  
Accumulated other comprehensive income loss $ 700