SEGMENT AND GEOGRAPHICAL INFORMATION - Schedule of Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total Operating Income	$ 123,314	$ 1,780	$ 236,242	$ 52,019
Unallocated interest expense and other	(9,991)	(10,558)	(34,165)	(27,225)
Total Income before Income Taxes	113,323	(8,778)	202,077	24,794
Integration and restructuring charges	0	430	0	16,415
Merger with Pope Resources
Segment Reporting Information [Line Items]
Integration and restructuring charges		400		16,400
Fund II Timberland Dispositions
Segment Reporting Information [Line Items]
Gain on sale			35,951	0
Southern Timber
Segment Reporting Information [Line Items]
Timber write-offs from casualty events		6,000		6,000
Timber Funds, Portion Attributable To Noncontrolling Interests
Segment Reporting Information [Line Items]
Total Operating Income	30,500	(10,300)	33,300	(12,300)
Timber write-offs from casualty events		7,300		7,300
Timber Funds, Portion Attributable To Noncontrolling Interests | Fund II Timberland Dispositions | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Gain on sale	28,800		28,800
Timber Funds, Portion Attributable To Parent
Segment Reporting Information [Line Items]
Timber write-offs from casualty events		1,800		1,800
Timber Funds, Portion Attributable To Parent | Fund II Timberland Dispositions | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Gain on sale	7,200
Timber Funds, Portion Attributable To Parent | Fund III And IV Timberland Dispositions | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Gain on sale			3,700
Real Estate | Disposal Group, Not Discontinued Operations
Segment Reporting Information [Line Items]
Total Operating Income	14,500		44,800	28,700
Operating Segments | Southern Timber
Segment Reporting Information [Line Items]
Total Operating Income	12,778	5,090	47,105	31,368
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Total Operating Income	2,071	(1,825)	5,293	(9,453)
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Total Operating Income	13,302	10,720	47,959	21,142
Operating Segments | Timber Funds
Segment Reporting Information [Line Items]
Total Operating Income	41,285	(12,370)	44,778	(14,262)
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Total Operating Income	60,617	9,459	112,816	61,081
Operating Segments | Trading
Segment Reporting Information [Line Items]
Total Operating Income	(33)	(557)	628	(474)
Corporate and Other
Segment Reporting Information [Line Items]
Total Operating Income	$ (6,706)	$ (8,737)	$ (22,337)	$ (37,383)