REVENUE - Disaggregation of Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 291,150	$ 195,558	$ 482,365	$ 454,688
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	15,380	16,747	36,637	42,154
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,577	1,189	11,710	6,708
Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,957	17,936	48,347	48,862
Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	187,781	120,705	331,994	222,111
Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	89,959	65,261	173,905	125,925
Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	97,822	55,444	158,089	96,186
Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	208,738	138,641	380,341	270,973
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	15,183	16,216	36,440	41,623
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,645	863	4,647	1,251
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,828	17,079	41,087	42,874
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	23,860	24,477	46,825	46,165
Southern Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,955	21,438	38,014	42,498
Southern Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,905	3,039	8,811	3,667
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	932	326	7,063	5,457
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	932	326	7,063	5,457
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	32,901	25,133	67,023	50,574
Pacific Northwest Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	32,901	25,133	67,023	50,574
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	80,252	40,725	137,586	76,359
New Zealand Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	19,250	12,126	36,356	25,817
New Zealand Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	61,002	28,599	101,230	50,542
Timber Funds | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	197	531	197	531
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	197	531	197	531
Timber Funds | Total Delivered
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,617	6,102	30,185	6,102
Timber Funds | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,617	6,102	30,185	6,102
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	34,151	24,268	50,375	42,911
Trading | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,236	462	2,327	934
Trading | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	32,915	23,806	48,048	41,977
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	49,294	46,767	100,971	99,749
Operating Segments | Southern Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	43,688	41,556	87,912	89,039
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	35,323	26,171	76,844	57,245
Operating Segments | Pacific Northwest Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	33,833	25,459	74,086	56,031
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	80,559	41,769	138,138	79,308
Operating Segments | New Zealand Timber | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	80,252	40,725	137,586	76,359
Operating Segments | Timber Funds
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	17,239	6,647	30,824	6,647
Operating Segments | Timber Funds | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	16,814	6,633	30,382	6,633
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	34,485	24,267	51,066	43,238
Operating Segments | Trading | Total Timber
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 34,151	$ 24,268	$ 50,375	$ 42,911