REVENUE - Disaggregation of Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 291,150	$ 195,558	$ 482,365	$ 454,688
Lease Revenue	281	72	513	72
Total Revenue	291,431	195,630	482,878	454,760
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	42,143	36,405	78,131	74,402
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	165,327	101,724	300,537	195,578
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,268	512	1,673	993
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	208,738	138,641	380,341	270,973
License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,717	4,525	9,288	9,268
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,111	2,456	7,523	5,619
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	334	(1)	691	327
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,162	6,980	17,502	15,214
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,340	6,427	19,592	6,427
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		8,426		8,426
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,297	27,234	30,062	29,631
Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		9,606		9,606
Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,855		3,855
Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(5,242)	(1,756)	(4,987)	(1,616)
Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	36,000		36,000	116,027
Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	74,250	49,937	84,522	168,501
Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	(1,468)	(930)	(2,907)	(943)
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	49,294	46,767	100,971	99,749
Total Revenue	49,294	46,767	100,971	99,749
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	23,728	24,685	45,584	52,178
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	18,692	16,359	40,655	35,868
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,268	512	1,673	993
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	43,688	41,556	87,912	89,039
Operating Segments | Southern Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,493	4,337	8,913	8,926
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,113	874	4,146	1,784
Operating Segments | Southern Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Southern Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,606	5,211	13,059	10,710
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	35,323	26,171	76,844	57,245
Total Revenue	35,323	26,171	76,844	57,245
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,078	3,163	4,573	6,290
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	31,755	22,296	69,513	49,741
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	33,833	25,459	74,086	56,031
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	117	95	207	192
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,373	617	2,551	1,022
Operating Segments | Pacific Northwest Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Pacific Northwest Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,490	712	2,758	1,214
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	80,559	41,769	138,138	79,308
Total Revenue	80,559	41,769	138,138	79,308
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,266	5,766	21,809	10,613
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	67,986	34,959	115,777	65,746
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	80,252	40,725	137,586	76,359
Operating Segments | New Zealand Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	81	83	139	140
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	226	961	413	2,809
Operating Segments | New Zealand Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | New Zealand Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	307	1,044	552	2,949
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	17,239	6,647	30,824	6,647
Total Revenue	18,646	7,524	33,585	7,524
Operating Segments | Timber Funds | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	395	328	655	328
Operating Segments | Timber Funds | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,419	6,305	29,727	6,305
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	16,814	6,633	30,382	6,633
Operating Segments | Timber Funds | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	26	10	29	10
Operating Segments | Timber Funds | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	399	4	413	4
Operating Segments | Timber Funds | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Operating Segments | Timber Funds | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	425	14	442	14
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	74,250	49,937	84,522	168,501
Lease Revenue	281	72	513	72
Total Revenue	74,531	50,009	85,035	168,573
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,340	6,427	19,592	6,427
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		8,426		8,426
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,297	27,234	30,062	29,631
Operating Segments | Real Estate | Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		9,606		9,606
Operating Segments | Real Estate | Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,855		3,855
Operating Segments | Real Estate | Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(5,242)	(1,756)	(4,987)	(1,616)
Operating Segments | Real Estate | Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	36,000		36,000	116,027
Operating Segments | Real Estate | Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	74,250	49,937	84,522	168,501
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	34,485	24,267	51,066	43,238
Total Revenue	34,546	24,320	51,212	43,304
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,676	2,463	5,510	4,993
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	30,475	21,805	44,865	37,918
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	34,151	24,268	50,375	42,911
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	334	(1)	691	327
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	334	(1)	691	327
Intersegment | Timber Funds
Disaggregation of Revenue [Line Items]
Total Revenue	1,407	877	2,761	877
Intersegment | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	61	53	146	66
Intersegment | Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	$ (1,468)	$ (930)	$ (2,907)	$ (943)