SEGMENT AND GEOGRAPHICAL INFORMATION - Schedule of Segment Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales	$ 859,154	$ 711,556	$ 816,138
Timber Funds, Portion Attributable To Noncontrolling Interests
Segment Reporting Information [Line Items]
Sales	22,700
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales	(3,676)	(155)	(92)
Operating Segments | Southern Timber
Segment Reporting Information [Line Items]
Sales	191,831	194,111	169,995
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Sales	120,809	85,414	109,832
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Sales	202,315	241,861	249,014
Operating Segments | Timber Funds
Segment Reporting Information [Line Items]
Sales	29,557	0	0
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Sales	229,345	74,887	138,575
Operating Segments | Real Estate | Large Dispositions
Segment Reporting Information [Line Items]
Sales	116,027	0	0
Operating Segments | Real Estate | Improved Development
Segment Reporting Information [Line Items]
Sales	14,498	5,882	8,336
Operating Segments | Real Estate | Unimproved Development
Segment Reporting Information [Line Items]
Sales	8,426	19,476	8,621
Operating Segments | Real Estate | Rural
Segment Reporting Information [Line Items]
Sales	67,152	47,647	46,280
Operating Segments | Real Estate | Timberland & Non-Strategic
Segment Reporting Information [Line Items]
Sales	19,255	1,338	75,281
Operating Segments | Real Estate | Conservation Easement
Segment Reporting Information [Line Items]
Sales	3,099	0	0
Operating Segments | Real Estate | Deferred Revenue/Other
Segment Reporting Information [Line Items]
Sales	888	544	57
Operating Segments | Trading
Segment Reporting Information [Line Items]
Sales	88,973	115,438	148,814
Intersegment Eliminations | Timber Funds
Segment Reporting Information [Line Items]
Sales	3,437
Intersegment Eliminations | Trading
Segment Reporting Information [Line Items]
Sales	239	155	92
Intersegment Eliminations | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales	$ (3,676)	$ (155)	$ (92)