REVENUE - Disaggregation of Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 364,382	$ 198,551	$ 846,747	$ 653,238
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,466	15,272	49,103	57,426
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,238	782	13,949	7,490
Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	14,704	16,054	63,052	64,916
Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	162,115	143,675	494,108	365,785
Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	76,053	77,339	249,957	203,263
Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	86,062	66,336	244,151	162,522
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	176,819	159,729	557,160	430,701
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,335	14,518	48,775	56,141
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	392	310	5,040	1,561
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	12,727	14,828	53,815	57,702
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	26,558	27,349	73,381	73,513
Southern Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,515	21,976	57,528	64,473
Southern Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	7,043	5,373	15,853	9,040
Pacific Northwest Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Pacific Northwest Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,846	472	8,909	5,929
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,846	472	8,909	5,929
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,404	27,004	95,427	77,579
Pacific Northwest Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	28,404	27,004	95,427	77,579
Pacific Northwest Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
New Zealand Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
New Zealand Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
New Zealand Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
New Zealand Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75,308	59,343	212,894	135,702
New Zealand Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,614	20,127	56,970	45,944
New Zealand Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	54,694	39,216	155,924	89,758
Timber Funds | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	131	754	328	1,285
Timber Funds | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Timber Funds | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	131	754	328	1,285
Timber Funds | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,703	7,870	36,888	13,971
Timber Funds | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,703	7,870	36,888	13,971
Timber Funds | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Trading | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Trading | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Trading | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Trading | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25,142	22,109	75,518	65,020
Trading | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	817	362	3,144	1,296
Trading | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	24,325	21,747	72,374	63,724
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44,818	47,653	145,789	147,402
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	39,285	42,177	127,196	131,215
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	31,513	28,885	108,357	86,131
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	30,250	27,476	104,336	83,508
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75,558	62,804	213,696	142,112
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	75,308	59,343	212,894	135,702
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	93,970	8,633	124,795	15,279
Operating Segments | Timber Funds | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,834	8,624	37,216	15,256
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	25,492	22,109	76,558	65,347
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 25,142	$ 22,109	$ 75,518	$ 65,020