SEGMENT AND GEOGRAPHICAL INFORMATION (Schedule of Operating Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total Operating Income	$ 46,378	$ 39,271	$ 155,097	$ 135,426
Unallocated interest expense and other	(7,343)	(7,425)	(19,972)	(23,950)
INCOME BEFORE INCOME TAXES	39,035	31,846	135,125	111,476
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	9,183	11,436	37,061	35,031
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Total Operating Income	1,911	1,134	12,209	(1,278)
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Total Operating Income	16,416	19,280	50,141	41,510
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Total Operating Income	24,726	11,437	71,645	72,052
Operating Segments | Trading
Segment Reporting Information [Line Items]
Total Operating Income	304	1,142	680	3,380
Corporate and other
Segment Reporting Information [Line Items]
Total Operating Income	$ (6,162)	$ (5,158)	$ (16,639)	$ (15,269)