REVENUE (Disaggregation of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Timber Sales	$ 259,130	$ 191,546
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Timber Sales	25,407	28,008
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Timber Sales	5,519	2,095
Total Stumpage
Disaggregation of Revenue [Line Items]
Timber Sales	30,926	30,103
Total Delivered
Disaggregation of Revenue [Line Items]
Timber Sales	101,406	127,499
Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Timber Sales	60,664	62,259
Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Timber Sales	40,742	65,240
Total Timber
Disaggregation of Revenue [Line Items]
Timber Sales	132,332	157,602
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Timber Sales	25,407	28,008
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Timber Sales	388	2,095
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Timber Sales	25,795	30,103
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Timber Sales	21,688	20,934
Southern Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Timber Sales	21,060	19,338
Southern Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Timber Sales	628	1,596
Pacific Northwest Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
Pacific Northwest Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Timber Sales	5,131	0
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Timber Sales	5,131	0
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Timber Sales	25,441	20,097
Pacific Northwest Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Timber Sales	25,441	20,097
Pacific Northwest Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
New Zealand Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
New Zealand Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
New Zealand Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
New Zealand Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Timber Sales	35,635	54,630
New Zealand Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Timber Sales	13,691	20,700
New Zealand Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Timber Sales	21,944	33,930
Trading
Disaggregation of Revenue [Line Items]
Timber Sales	18,971	32,036
Trading | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
Trading | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
Trading | Total Stumpage
Disaggregation of Revenue [Line Items]
Timber Sales	0	0
Trading | Total Delivered
Disaggregation of Revenue [Line Items]
Timber Sales	18,642	31,838
Trading | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Timber Sales	472	2,124
Trading | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Timber Sales	18,170	29,714
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Timber Sales	52,982	60,846
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Timber Sales	47,483	51,037
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Timber Sales	31,075	20,535
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Timber Sales	30,572	20,097
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Timber Sales	37,538	57,130
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Timber Sales	35,635	54,630
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Timber Sales	18,984	32,065
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Timber Sales	$ 18,642	$ 31,838