REVENUE (Disaggregation of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 184,800	$ 245,906	$ 376,346	$ 449,101
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	15,172	19,855	43,180	42,364
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	581	4,861	2,675	11,785
Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	15,753	24,716	45,855	54,149
Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	135,119	158,826	262,620	287,689
Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	59,123	69,054	121,382	128,851
Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	75,996	89,772	141,238	158,838
Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	150,872	183,542	308,475	341,838
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	15,172	19,855	43,180	42,364
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	581	256	2,675	2,074
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	15,753	20,111	45,855	44,438
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	21,234	17,179	42,168	30,990
Southern Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	17,041	15,166	36,379	28,543
Southern Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	4,193	2,013	5,789	2,447
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	4,605	0	9,711
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	4,605	0	9,711
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	17,674	26,674	37,771	52,054
Pacific Northwest Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	17,674	26,674	37,771	52,054
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	61,008	69,007	115,639	119,596
New Zealand Timber | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	21,739	25,647	42,439	45,750
New Zealand Timber | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	39,269	43,360	73,200	73,846
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	35,203	45,966	67,042	85,049
Trading | Total Delivered | Delivered Wood (Domestic)
Disaggregation of Revenue [Line Items]
Total Timber Sales	2,669	1,567	4,793	2,504
Trading | Total Delivered | Delivered Wood (Export)
Disaggregation of Revenue [Line Items]
Total Timber Sales	32,534	44,399	62,249	82,545
Operating Segments | Southern Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	46,197	48,047	107,043	91,635
Operating Segments | Southern Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	36,987	37,290	88,023	75,428
Operating Segments | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	18,556	32,213	39,091	63,587
Operating Segments | Pacific Northwest Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	17,674	31,279	37,771	61,765
Operating Segments | New Zealand Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	62,127	69,653	119,257	122,617
Operating Segments | New Zealand Timber | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	61,008	69,007	115,639	119,596
Operating Segments | Trading
Disaggregation of Revenue [Line Items]
Total Timber Sales	35,387	46,133	67,423	85,338
Operating Segments | Trading | Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 35,203	$ 45,966	$ 67,042	$ 85,049