COMMITMENTS (Narrative) (Details) - Timberland Leases	3 Months Ended
	Mar. 31, 2018
United States | Minimum
Loss Contingencies [Line Items]
Contract terms, in years	30 years
United States | Maximum
Loss Contingencies [Line Items]
Contract terms, in years	65 years
New Zealand | Minimum
Loss Contingencies [Line Items]
Contract terms, in years	30 years
New Zealand | Maximum
Loss Contingencies [Line Items]
Contract terms, in years	99 years