REVENUE (Disaggregation of Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 198,551	$ 156,417	$ 653,238	$ 532,764
Lease Revenue	324		397
Total Revenue	198,875	156,417	653,635	532,764
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	34,728	31,927	109,119	108,623
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	124,241	101,274	319,830	330,576
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	760	2,338	1,752	4,816
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	159,729	135,539	430,701	444,015
License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,767	4,641	14,034	13,463
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,588	6,876	11,209	22,011
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		149	327	531
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10,355	11,666	25,570	36,005
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,344	4,492	7,771	5,007
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	8,426	15,430
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	23,245	4,212	52,876	30,525
Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	42	57	9,647	1,263
Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,099		3,099
Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	737	451	(879)	519
Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers			116,027
Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,467	9,212	196,967	52,744
Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,633		15,279
Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	22,109	25,158	65,347	92,582
Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	(1,366)	(34)	(2,310)	(137)
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	47,653	41,282	147,402	148,325
Total Revenue	47,653	41,282	147,402	148,325
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	22,061	19,093	74,239	65,202
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,356	11,581	55,224	51,019
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	760	2,338	1,752	4,816
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	42,177	33,012	131,215	121,037
Operating Segments | Southern Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,461	4,351	13,386	12,772
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,015	3,919	2,801	14,516
Operating Segments | Southern Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		0	0	0
Operating Segments | Southern Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,476	8,270	16,187	27,288
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,885	18,766	86,131	57,856
Total Revenue	28,885	18,766	86,131	57,856
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,963	2,109	8,253	7,196
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25,513	16,064	75,255	48,748
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	27,476	18,173	83,508	55,944
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	252	199	444	404
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,157	394	2,179	1,508
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 | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,409	593	2,623	1,912
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	62,804	61,999	142,112	181,257
Total Revenue	62,804	61,999	142,112	181,257
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	7,943	7,930	18,545	25,278
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	51,400	51,415	117,157	149,705
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	59,343	59,345	135,702	174,983
Operating Segments | New Zealand Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	60	91	200	287
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,401	2,563	6,210	5,987
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 | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,461	2,654	6,410	6,274
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		0		0
Total Revenue	9,907	0	17,431	0
Operating Segments | Timber Funds | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	227	0	555	0
Operating Segments | Timber Funds | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,397	0	14,701	0
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	8,624	0	15,256	0
Operating Segments | Timber Funds | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(6)	0	4	0
Operating Segments | Timber Funds | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	15	0	19	0
Operating Segments | Timber Funds | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		0	0	0
Operating Segments | Timber Funds | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9	0	23	0
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,467	9,212	196,967	52,744
Lease Revenue	324		397
Total Revenue	28,791	9,212	197,364	52,744
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,344	4,492	7,771	5,007
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	8,426	15,430
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	23,245	4,212	52,876	30,525
Operating Segments | Real Estate | Timberland & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	42	57	9,647	1,263
Operating Segments | Real Estate | Conservation Easement
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,099		3,099
Operating Segments | Real Estate | Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	737	451	(879)	519
Operating Segments | Real Estate | Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers			116,027
Operating Segments | Real Estate | Total Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,467	9,212	196,967	52,744
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	22,201	25,192	65,505	92,719
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,534	2,795	7,527	10,947
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,575	22,214	57,493	81,104
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	22,109	25,009	65,020	92,051
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		149	327	531
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	149	327	531
Intersegment | Timber Funds
Disaggregation of Revenue [Line Items]
Total Revenue	1,274		2,152
Intersegment | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	92	34	158	137
Intersegment | Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	$ (1,366)	$ (34)	$ (2,310)	$ (137)