REVENUE (Disaggregation of Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 259,130	$ 191,546
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue	37,997	42,712
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue	93,854	113,804
Hardwood
Disaggregation of Revenue [Line Items]
Revenue	481	1,086
Total Timber
Disaggregation of Revenue [Line Items]
Revenue	132,332	157,602
License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue	4,743	4,083
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue	3,162	8,664
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue	329	198
Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue	8,234	12,945
Improved Development
Disaggregation of Revenue [Line Items]
Revenue	0	341
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue	0	1,000
Rural
Disaggregation of Revenue [Line Items]
Revenue	2,397	12,665
Timberlands & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue	0	6,934
Other
Disaggregation of Revenue [Line Items]
Revenue	140	59
Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue	116,027
Real Estate
Disaggregation of Revenue [Line Items]
Revenue	118,564	20,999
Trading
Disaggregation of Revenue [Line Items]
Revenue	18,971	32,036
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue	52,982	60,846
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue	27,493	26,799
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue	19,509	23,152
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue	481	1,086
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue	47,483	51,037
Operating Segments | Southern Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue	4,589	4,026
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue	910	5,783
Operating Segments | Southern Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Southern Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue	5,499	9,809
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue	31,075	20,535
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue	3,127	2,820
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue	27,445	17,277
Operating Segments | Pacific Northwest Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue	30,572	20,097
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue	97	4
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue	406	434
Operating Segments | Pacific Northwest Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Pacific Northwest Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue	503	438
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue	37,538	57,130
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue	4,847	8,767
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue	30,788	45,863
Operating Segments | New Zealand Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue	35,635	54,630
Operating Segments | New Zealand Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue	57	53
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue	1,846	2,447
Operating Segments | New Zealand Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | New Zealand Timber | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue	1,903	2,500
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue	118,564	20,999
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue	0	341
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue	0	1,000
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue	2,397	12,665
Operating Segments | Real Estate | Timberlands & Non-Strategic
Disaggregation of Revenue [Line Items]
Revenue	0	6,934
Operating Segments | Real Estate | Other
Disaggregation of Revenue [Line Items]
Revenue	140	59
Operating Segments | Real Estate | Large Dispositions
Disaggregation of Revenue [Line Items]
Revenue	116,027
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue	18,984	32,065
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue	2,530	4,326
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue	16,112	27,512
Operating Segments | Trading | Hardwood
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Revenue	18,642	31,838
Operating Segments | Trading | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Trading | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Operating Segments | Trading | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue	329	198
Operating Segments | Trading | Total Non-Timber Sales
Disaggregation of Revenue [Line Items]
Revenue	329	198
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(13)	(29)
Intersegment Eliminations | Trading
Disaggregation of Revenue [Line Items]
Revenue	$ 13	$ 29