SEGMENT AND GEOGRAPHICAL INFORMATION (Schedule of Operating Income (Loss)) (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]
Total Operating Income	$ 51,645	$ 46,893	$ 108,720	$ 96,154
Unallocated interest expense and other	(5,197)	(8,627)	(12,630)	(16,524)
INCOME BEFORE INCOME TAXES	46,448	38,266	96,090	79,630
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	15,651	9,655	27,878	23,594
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Total Operating Income	5,625	(1,535)	10,299	(2,413)
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Total Operating Income	17,768	26,804	33,725	37,046
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Total Operating Income	18,864	16,133	46,918	45,798
Operating Segments | Trading
Segment Reporting Information [Line Items]
Total Operating Income	227	1,141	376	2,239
Corporate and other
Segment Reporting Information [Line Items]
Total Operating Income	$ (6,490)	$ (5,305)	$ (10,476)	$ (10,110)