DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($)
Interest rate swap locks
Derivative [Line Items]
Derivative Instrument, Amount De-Designated And Partially Settled	$ 11,100
Derivatives designated as cash flow hedges: \| Derivatives designated as cash flow hedges: \| Carbon option contracts
Derivative [Line Items]
AOCI gain (loss) balance expected to be reclassified in next twelve months, net of tax	500
Derivatives designated as cash flow hedges: \| Derivatives designated as cash flow hedges: \| Treasury locks
Derivative [Line Items]
Gain (loss) on treasury lock recorded to AOCI	(20,800)
Derivatives designated as cash flow hedges: \| Derivatives designated as cash flow hedges: \| Interest rate swap locks
Derivative [Line Items]
Gain (loss) on treasury lock recorded to AOCI	$ (1,400)
New Zealand JV \| Forecasted Sales and Purchases, term 1
Derivative [Line Items]
Length of time, foreign currency cash flow hedge	12 months
New Zealand JV \| Minimum \| Forecasted Sales and Purchases, term 1
Derivative [Line Items]
Percent of forecast sales and purchases hedged for 12 months	50.00%
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 \| Minimum \| Foreign Sales and Purchases, term 3
Derivative [Line Items]
Length of time, foreign currency cash flow hedge	18 months
New Zealand JV \| Maximum \| Forecasted Sales and Purchases, term 1
Derivative [Line Items]
Percent of forecast sales and purchases hedged for 12 months	90.00%
New Zealand JV \| Maximum \| Forecasted Sales and Purchases, term 2
Derivative [Line Items]
Length of time, foreign currency cash flow hedge	18 months
Percent of forecast sales and purchases hedged for 12 to 18 months	75.00%
New Zealand JV \| Maximum \| Foreign Sales and Purchases, term 3
Derivative [Line Items]
Percent of forecast sales and purchases hedged for 12 months	50.00%
Length of time, foreign currency cash flow hedge	48 months

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Length of Time, Foreign Currency Cash Flow Hedge

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Percentage Of Foreign Currency Exposure Hedged For Forecasted Sales In Next Twelve Months [Member]

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Percentage of Foreign Currency Exposure Hedged For Forecasted Sales In Next Twelve to Eighteen Months

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- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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-Name Accounting Standards Codification
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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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