REVENUE - Disaggregation of Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 364,382	$ 198,551	$ 846,747	$ 653,238
Lease Revenue	344	324	857	397
Total Revenue	364,726	198,875	847,604	653,635
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	38,208	34,728	116,340	109,119
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	138,364	124,241	438,900	319,830
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	247	760	1,920	1,752
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	176,819	159,729	557,160	430,701
License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,058	4,767	14,347	14,034
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,024	5,588	9,548	11,209
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	350		1,040	327
Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	87,100		87,100
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	94,532	10,355	112,035	25,570
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	27,774	1,344	47,366	7,771
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	37,500	0	37,500	8,426
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,937	23,245	36,999	52,876
Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44	42	44	9,647
Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		3,099	3,855	3,099
Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	728	737	(4,260)	(879)
Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,048		56,048	116,027
Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	93,031	28,467	177,552	196,967
Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	(590)	(1,366)	(3,496)	(2,310)
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44,818	47,653	145,789	147,402
Total Revenue	44,818	47,653	145,789	147,402
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	21,358	22,061	66,941	74,239
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	17,680	19,356	58,335	55,224
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	247	760	1,920	1,752
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	39,285	42,177	127,196	131,215
Operating Segments | Southern Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,588	4,461	13,501	13,386
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	945	1,015	5,092	2,801
Operating Segments | Southern Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0	0
Operating Segments | Southern Timber | Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0
Operating Segments | Southern Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,533	5,476	18,593	16,187
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	31,513	28,885	108,357	86,131
Total Revenue	31,513	28,885	108,357	86,131
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,116	1,963	6,689	8,253
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,134	25,513	97,647	75,255
Operating Segments | Pacific Northwest Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	30,250	27,476	104,336	83,508
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	298	252	505	444
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	965	1,157	3,516	2,179
Operating Segments | Pacific Northwest Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0	0
Operating Segments | Pacific Northwest Timber | Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0
Operating Segments | Pacific Northwest Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,263	1,409	4,021	2,623
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75,558	62,804	213,696	142,112
Total Revenue	75,558	62,804	213,696	142,112
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10,746	7,943	32,555	18,545
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	64,562	51,400	180,339	117,157
Operating Segments | New Zealand Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75,308	59,343	212,894	135,702
Operating Segments | New Zealand Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	161	60	300	200
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	89	3,401	502	6,210
Operating Segments | New Zealand Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0	0
Operating Segments | New Zealand Timber | Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0
Operating Segments | New Zealand Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	250	3,461	802	6,410
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	93,970	8,633	124,795	15,279
Total Revenue	94,469	9,907	128,054	17,431
Operating Segments | Timber Funds | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	127	227	783	555
Operating Segments | Timber Funds | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,707	8,397	36,433	14,701
Operating Segments | Timber Funds | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Timber Funds | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,834	8,624	37,216	15,256
Operating Segments | Timber Funds | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11	(6)	41	4
Operating Segments | Timber Funds | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25	15	438	19
Operating Segments | Timber Funds | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0	0
Operating Segments | Timber Funds | Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	87,100		87,100
Operating Segments | Timber Funds | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	87,136	9	87,579	23
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	93,031	28,467	177,552	196,967
Lease Revenue	344	324	857	397
Total Revenue	93,375	28,791	178,409	197,364
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	27,774	1,344	47,366	7,771
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	37,500	0	37,500	8,426
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,937	23,245	36,999	52,876
Operating Segments | Real Estate | Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44	42	44	9,647
Operating Segments | Real Estate | Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		3,099	3,855	3,099
Operating Segments | Real Estate | Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	728	737	(4,260)	(879)
Operating Segments | Real Estate | Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,048		56,048	116,027
Operating Segments | Real Estate | Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	93,031	28,467	177,552	196,967
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25,492	22,109	76,558	65,347
Total Revenue	25,583	22,201	76,795	65,505
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,861	2,534	9,372	7,527
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	21,281	19,575	66,146	57,493
Operating Segments | Trading | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25,142	22,109	75,518	65,020
Operating Segments | Trading | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Trading | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Trading | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	350		1,040	327
Operating Segments | Trading | Fund II Timberland Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0		0
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	350	0	1,040	327
Intersegment | Timber Funds
Disaggregation of Revenue [Line Items]
Total Revenue	499	1,274	3,259	2,152
Intersegment | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	91	92	237	158
Intersegment | Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	$ (590)	$ (1,366)	$ (3,496)	$ (2,310)