REVENUE (Disaggregation of Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 191,546	$ 203,196
Total Revenue	191,546	203,196
Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	42,712	35,126
Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	113,804	122,576
Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,086	597
Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	157,602	158,299
License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,083	4,161
Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,664	4,549
Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	198	123
Non-timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,945	8,833
Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	341	1,121
Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,000	7,446
Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,665	1,652
Non-strategic / Timberlands
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,934	25,845
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	59
Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,999	36,064
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	60,846	43,588
Total Revenue	60,846	43,588
Operating Segments | Southern Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	26,799	21,606
Operating Segments | Southern Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	23,152	15,937
Operating Segments | Southern Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,086	597
Operating Segments | Southern Timber | Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	51,037	38,140
Operating Segments | Southern Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,026	4,084
Operating Segments | Southern Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,783	1,364
Operating Segments | Southern Timber | Agency Fee Income
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Southern Timber | Non-timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,809	5,448
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,535	31,374
Total Revenue	20,535	31,374
Operating Segments | Pacific Northwest Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,820	3,419
Operating Segments | Pacific Northwest Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	17,277	27,068
Operating Segments | Pacific Northwest Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Pacific Northwest Timber | Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,097	30,487
Operating Segments | Pacific Northwest Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4	25
Operating Segments | Pacific Northwest Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	434	862
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 | Non-timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	438	887
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	57,130	52,964
Total Revenue	57,130	52,964
Operating Segments | New Zealand Timber | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	8,767	5,844
Operating Segments | New Zealand Timber | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	45,863	44,745
Operating Segments | New Zealand Timber | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | New Zealand Timber | Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	54,630	50,589
Operating Segments | New Zealand Timber | License Revenue, Primarily From Hunting
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	53	52
Operating Segments | New Zealand Timber | Other Non-Timber/Carbon Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,447	2,323
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 | Non-timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,500	2,375
Operating Segments | New Zealand Timber | Non-strategic / Timberlands
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers		0
Operating Segments | Real Estate
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,999	36,064
Total Revenue	20,999	36,064
Operating Segments | Real Estate | Improved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	341	1,121
Operating Segments | Real Estate | Unimproved Development
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,000	7,446
Operating Segments | Real Estate | Rural
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,665	1,652
Operating Segments | Real Estate | Non-strategic / Timberlands
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,934	25,845
Operating Segments | Real Estate | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	59
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	32,036	39,206
Total Revenue	32,065	39,212
Operating Segments | Trading | Pulpwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,326	4,257
Operating Segments | Trading | Sawtimber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	27,512	34,826
Operating Segments | Trading | Hardwood
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0
Operating Segments | Trading | Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	31,838	39,083
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	198	123
Operating Segments | Trading | Non-timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	198	123
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	(29)	(6)
Total Revenue	(29)	(6)
Intersegment Eliminations | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 29	$ 6