REVENUE - Disaggregation of Revenue by Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 178,793	$ 156,417	$ 184,800	$ 191,546	$ 166,146	$ 200,890	$ 245,906	$ 203,196	$ 711,556	$ 816,138	$ 819,596
Trading
Disaggregation of Revenue [Line Items]
Sales									115,283	148,722
Domestic
Disaggregation of Revenue [Line Items]
Sales									354,395	390,396	419,402
Total Timber Sales
Disaggregation of Revenue [Line Items]
Sales									587,895	640,347	585,019
Total Timber Sales | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									159,156	143,863	122,639
Total Timber Sales | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									82,727	106,471	88,719
Total Timber Sales | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									231,406	241,943	222,455
Total Timber Sales | Trading
Disaggregation of Revenue [Line Items]
Sales									114,606	148,070	151,206
Total Timber Sales | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Sales									71,943	72,385	71,120
Total Timber Sales | Stumpage Pay-as-Cut | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									71,943	72,385	71,120
Total Timber Sales | Stumpage Pay-as-Cut | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Stumpage Pay-as-Cut | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Stumpage Pay-as-Cut | Trading
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Sales									10,177	16,842	19,721
Total Timber Sales | Stumpage Lump Sum | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									7,428	4,988	9,093
Total Timber Sales | Stumpage Lump Sum | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									2,749	11,854	10,628
Total Timber Sales | Stumpage Lump Sum | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Stumpage Lump Sum | Trading
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Stumpage Agreed Volume
Disaggregation of Revenue [Line Items]
Sales											1,234
Total Timber Sales | Stumpage Agreed Volume | Southern Timber
Disaggregation of Revenue [Line Items]
Sales											0
Total Timber Sales | Stumpage Agreed Volume | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales											1,234
Total Timber Sales | Stumpage Agreed Volume | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales											0
Total Timber Sales | Stumpage Agreed Volume | Trading
Disaggregation of Revenue [Line Items]
Sales											0
Total Timber Sales | Total Stumpage
Disaggregation of Revenue [Line Items]
Sales									82,120	89,227	92,075
Total Timber Sales | Total Stumpage | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									79,371	77,373	80,213
Total Timber Sales | Total Stumpage | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									2,749	11,854	11,862
Total Timber Sales | Total Stumpage | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Total Stumpage | Trading
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Total Delivered
Disaggregation of Revenue [Line Items]
Sales									505,775	551,120	492,944
Total Timber Sales | Total Delivered | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									79,785	66,490	42,426
Total Timber Sales | Total Delivered | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									79,978	94,617	76,857
Total Timber Sales | Total Delivered | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									231,406	241,943	222,455
Total Timber Sales | Total Delivered | Trading
Disaggregation of Revenue [Line Items]
Sales									114,606	148,070	151,206
Total Timber Sales | Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Sales									237,494	252,320	209,548
Total Timber Sales | Total Delivered | Domestic | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									71,054	60,931	42,426
Total Timber Sales | Total Delivered | Domestic | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									79,978	94,617	76,857
Total Timber Sales | Total Delivered | Domestic | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									80,974	90,631	84,221
Total Timber Sales | Total Delivered | Domestic | Trading
Disaggregation of Revenue [Line Items]
Sales									5,488	6,141	6,044
Total Timber Sales | Total Delivered | Export
Disaggregation of Revenue [Line Items]
Sales									268,281	298,800	283,396
Total Timber Sales | Total Delivered | Export | Southern Timber
Disaggregation of Revenue [Line Items]
Sales									8,731	5,559	0
Total Timber Sales | Total Delivered | Export | Pacific Northwest Timber
Disaggregation of Revenue [Line Items]
Sales									0	0	0
Total Timber Sales | Total Delivered | Export | New Zealand Timber
Disaggregation of Revenue [Line Items]
Sales									150,432	151,312	138,234
Total Timber Sales | Total Delivered | Export | Trading
Disaggregation of Revenue [Line Items]
Sales									$ 109,118	$ 141,929	$ 145,162