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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash Flow Hedging | Designated as Hedging Instrument    
Derivative [Line Items]    
AOCI gain (loss) balance expected to be reclassified in next twelve months, net of tax $ (200)  
New Zealand JV | Forecasted Sales and Purchases, term 1    
Derivative [Line Items]    
Length of time, foreign currency cash flow hedge 3 months  
New Zealand JV | Minimum    
Derivative [Line Items]    
Percent of forecast sales and purchases hedged for 3 months 35.00%  
Percent of forecast sales and purchases hedged for three to 12 months 25.00%  
New Zealand JV | Minimum | Forecasted Sales and Purchases, term 1    
Derivative [Line Items]    
Length of time, foreign currency cash flow hedge 3 months  
New Zealand JV | Minimum | Forecasted Sales and Purchases, term 2    
Derivative [Line Items]    
Length of time, foreign currency cash flow hedge 12 months  
New Zealand JV | Maximum    
Derivative [Line Items]    
Percent of forecast sales and purchases hedged for 3 months 90.00%  
Percent of forecast sales and purchases hedged for three to 12 months 75.00%  
Percent of forecast sales and purchases hedged for 12 to 18 months 50.00%  
New Zealand JV | Maximum | Forecasted Sales and Purchases, term 1    
Derivative [Line Items]    
Length of time, foreign currency cash flow hedge 12 months  
New Zealand JV | Maximum | Forecasted Sales and Purchases, term 2    
Derivative [Line Items]    
Length of time, foreign currency cash flow hedge 18 months  
Interest and other miscellaneous income, net | Not Designated as Hedging Instrument | Carbon option    
Derivative [Line Items]    
Non-designated hedged item, gain (loss) recognized in income $ 402 $ 0