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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivatives designated as cash flow hedges: | Designated as Hedging Instrument        
Derivative [Line Items]        
AOCI gain (loss) balance expected to be reclassified in next twelve months, net of tax     $ (500)  
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%   35.00%  
Percent of forecast sales and purchases hedged for three to 12 months 25.00%   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%   90.00%  
Percent of forecast sales and purchases hedged for three to 12 months 75.00%   75.00%  
Percent of forecast sales and purchases hedged for 12 to 18 months 50.00%   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 | Derivatives not designated as hedging instruments: | Carbon option        
Derivative [Line Items]        
Non-designated hedged item, gain (loss) recognized in income $ 12 $ 0 $ 415 $ 0