REVENUE (Disaggregation of Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 195,558	$ 184,800	$ 454,688	$ 376,346
Lease Revenue	72		72
Total Revenue	195,630	184,800	454,760	376,346
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	36,405	33,984	74,402	76,697
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	101,724	115,497	195,578	229,301
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	512	1,391	993	2,477
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	138,641	150,872	270,973	308,475
License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,525	4,541	9,268	8,820
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,456	6,670	5,619	15,138
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(1)	184	327	381
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,980	11,395	15,214	24,339
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,427	172	6,427	514
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,426	14,431	8,426	15,430
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	27,234	7,107	29,631	26,313
Timberlands & Non-Strategic (a)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,606	815	9,606	1,207
Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(1,756)	8	(1,616)	68
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	49,937	22,533	168,501	43,532
Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,647		6,647
Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	24,267	35,387	43,238	67,423
Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	(930)	(74)	(943)	(103)
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	46,767	46,197	99,749	107,043
Total Revenue	46,767	46,197	99,749	107,043
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	24,685	19,310	52,178	46,109
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,359	16,286	35,868	39,437
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	512	1,391	993	2,477
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	41,556	36,987	89,039	88,023
Operating Segments | Southern Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,337	4,296	8,926	8,420
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	874	4,914	1,784	10,600
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	5,211	9,210	10,710	19,020
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	26,171	18,556	57,245	39,091
Total Revenue	26,171	18,556	57,245	39,091
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,163	2,267	6,290	5,087
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	22,296	15,407	49,741	32,684
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	25,459	17,674	56,031	37,771
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	95	103	192	205
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	617	779	1,022	1,115
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	712	882	1,214	1,320
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	41,769	62,127	79,308	119,257
Total Revenue	41,769	62,127	79,308	119,257
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,766	8,581	10,613	17,349
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	34,959	52,427	65,746	98,290
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	40,725	61,008	76,359	115,639
Operating Segments | New Zealand Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	83	142	140	195
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	961	977	2,809	3,423
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	1,044	1,119	2,949	3,618
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		0		0
Total Revenue	7,524	0	7,524	0
Operating Segments | Timber Funds | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	328	0	328	0
Operating Segments | Timber Funds | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,305	0	6,305	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	6,633	0	6,633	0
Operating Segments | Timber Funds | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10	0	10	0
Operating Segments | Timber Funds | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4	0	4	0
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	14	0	14	0
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	49,937	22,533	168,501	43,532
Lease Revenue	72		72
Total Revenue	50,009	22,533	168,573	43,532
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,427	172	6,427	514
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,426	14,431	8,426	15,430
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	27,234	7,107	29,631	26,313
Operating Segments | Real Estate | Timberlands & Non-Strategic (a)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,606	815	9,606	1,207
Operating Segments | Real Estate | Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(1,756)	8	(1,616)	68
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	49,937	22,533	168,501	43,532
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	24,320	35,461	43,304	67,526
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,463	3,826	4,993	8,152
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	21,805	31,377	37,918	58,890
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	24,268	35,203	42,911	67,042
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	(1)	184	327	381
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(1)	184	327	381
Intersegment Eliminations | Timber Funds
Disaggregation of Revenue [Line Items]
Total Revenue	877		877
Intersegment Eliminations | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	53	74	66	103
Intersegment Eliminations | Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	$ (930)	$ (74)	$ (943)	$ (103)