REVENUE (Disaggregation of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 156,417	$ 200,890	$ 532,764	$ 649,991
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	13,077	16,984	56,257	59,348
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	1,677	2,427	4,353	14,212
Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	14,754	19,411	60,610	73,560
Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	120,785	137,196	383,405	424,886
Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	58,116	67,352	179,499	196,203
Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	62,669	69,844	203,906	228,683
Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	135,539	156,607	444,015	498,446
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	13,077	16,984	56,257	59,348
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	1,677	284	4,353	2,358
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	14,754	17,268	60,610	61,706
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,258	17,535	60,427	48,526
Southern Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	16,597	15,856	52,977	44,399
Southern Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	1,661	1,679	7,450	4,127
Pacific Northwest Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
Pacific Northwest Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	2,143	0	11,854
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	2,143	0	11,854
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,173	24,912	55,944	76,966
Pacific Northwest Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,173	24,912	55,944	76,966
Pacific Northwest Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
New Zealand Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
New Zealand Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
New Zealand Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
New Zealand Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	59,345	63,941	174,983	183,537
New Zealand Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	22,722	24,771	65,161	70,521
New Zealand Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	36,623	39,170	109,822	113,016
Trading | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
Trading | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
Trading | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0	0	0
Trading | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	25,009	30,808	92,051	115,857
Trading | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	624	1,813	5,417	4,317
Trading | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	24,385	28,995	86,634	111,540
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	41,282	39,662	148,325	131,298
Operating Segments | Southern Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	33,012	34,803	121,037	110,232
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,766	27,815	57,856	91,402
Operating Segments | Pacific Northwest Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,173	27,055	55,944	88,820
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	61,999	66,265	181,257	188,882
Operating Segments | New Zealand Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	59,345	63,941	174,983	183,537
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Total Timber Sales	25,158	30,980	92,582	116,317
Operating Segments | Trading | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 25,009	$ 30,808	$ 92,051	$ 115,857