SEGMENT AND GEOGRAPHICAL INFORMATION (Schedule of Non-Cash Cost of Land and Improved Development) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	$ 13,312	$ 2,880	$ 14,936	$ 13,102
Southern Timber
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	0	0	0	0
Pacific Northwest Timber
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	0	0	0	0
New Zealand Timber
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	0	128	0	128
Real Estate
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	13,312	2,752	14,936	12,974
Real Estate | Timberland | Large Dispositions
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT				5,700
Trading
Segment Reporting Information [Line Items]
NON-CASH COST OF LAND AND IMPROVED DEVELOPMENT	$ 0	$ 0	$ 0	$ 0