SEGMENT AND GEOGRAPHICAL INFORMATION (Schedule of Operating Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total Operating Income	$ 57,074	$ 49,261
Unallocated interest expense and other	(7,432)	(7,897)
INCOME BEFORE INCOME TAXES	49,642	41,364
Real Estate | Large Dispositions | Timberland
Segment Reporting Information [Line Items]
Total Operating Income		(28,200)
Operating Segments | Southern Timber
Segment Reporting Information [Line Items]
Total Operating Income	12,227	13,939
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Total Operating Income	4,674	(878)
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Total Operating Income	15,957	10,243
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Total Operating Income	28,054	29,665
Operating Segments | Trading
Segment Reporting Information [Line Items]
Total Operating Income	149	1,097
Corporate and other
Segment Reporting Information [Line Items]
Total Operating Income	$ (3,987)	$ (4,805)