REVENUE - Disaggregation of Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 191,215	$ 259,130
Lease Revenue	232	0
Total Revenue	191,447	259,130
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	35,988	37,997
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	135,210	93,854
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	405	481
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	171,603	132,332
License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,569	4,743
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,415	3,162
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	356	329
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,340	8,234
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	252
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,765	2,397
Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	255	140
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	10,272	118,564
Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	(1,439)	(13)
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	51,677	52,982
Total Revenue	51,677	52,982
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	21,856	27,493
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	21,963	19,509
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	405	481
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44,224	47,483
Operating Segments | Southern Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,417	4,589
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,036	910
Operating Segments | Southern Timber | Agency Fee Income
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	7,453	5,499
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	41,522	31,075
Total Revenue	41,522	31,075
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,495	3,127
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	37,758	27,445
Operating Segments | Pacific Northwest Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	40,253	30,572
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	91	97
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,178	406
Operating Segments | Pacific Northwest Timber | Agency Fee Income
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	1,269	503
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	57,579	37,538
Total Revenue	57,579	37,538
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,542	4,847
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	47,792	30,788
Operating Segments | New Zealand Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	57,334	35,635
Operating Segments | New Zealand Timber | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	58	57
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	187	1,846
Operating Segments | New Zealand Timber | Agency Fee Income
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	245	1,903
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13,585	0
Total Revenue	14,939	0
Operating Segments | Timber Funds | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	260	0
Operating Segments | Timber Funds | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13,308	0
Operating Segments | Timber Funds | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Timber Funds | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	13,568	0
Operating Segments | Timber Funds | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3	0
Operating Segments | Timber Funds | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14	0
Operating Segments | Timber Funds | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Timber Funds | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	17	0
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10,272	118,564
Lease Revenue	232
Total Revenue	10,504	118,564
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	252
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,765	2,397
Operating Segments | Real Estate | Deferred Revenue/Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	255	140
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	10,272	118,564
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,580	18,971
Total Revenue	16,665	18,984
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,835	2,530
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14,389	16,112
Operating Segments | Trading | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,224	18,642
Operating Segments | Trading | License Revenue, Primarily from Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Trading | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Trading | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	356	329
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	356	329
Intersegment | Timber Funds
Disaggregation of Revenue [Line Items]
Total Revenue	1,354
Intersegment | Trading
Disaggregation of Revenue [Line Items]
Total Revenue	85	13
Intersegment | Elim.
Disaggregation of Revenue [Line Items]
Total Revenue	$ (1,439)	$ (13)