REVENUE (Disaggregation of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 191,546	$ 203,196
Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	28,008	22,511
Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	2,095	6,924
Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	30,103	29,435
Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	127,499	128,864
Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Total Timber Sales	62,259	59,798
Total Delivered | Foreign
Disaggregation of Revenue [Line Items]
Total Timber Sales	65,240	69,066
Timber
Disaggregation of Revenue [Line Items]
Total Timber Sales	157,602	158,299
Southern Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	28,008	22,511
Southern Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	2,095	1,818
Southern Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	30,103	24,329
Southern Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	20,934	13,811
Southern Timber | Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Total Timber Sales	19,338	13,377
Southern Timber | Total Delivered | Foreign
Disaggregation of Revenue [Line Items]
Total Timber Sales	1,596	434
Pacific Northwest Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
Pacific Northwest Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	5,106
Pacific Northwest Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	5,106
Pacific Northwest Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	20,097	25,381
Pacific Northwest Timber | Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Total Timber Sales	20,097	25,381
Pacific Northwest Timber | Total Delivered | Foreign
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
New Zealand Timber | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
New Zealand Timber | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
New Zealand Timber | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
New Zealand Timber | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	54,630	50,589
New Zealand Timber | Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Total Timber Sales	20,700	20,103
New Zealand Timber | Total Delivered | Foreign
Disaggregation of Revenue [Line Items]
Total Timber Sales	33,930	30,486
Trading | Stumpage Pay-as-Cut
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
Trading | Stumpage Lump Sum
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
Trading | Total Stumpage
Disaggregation of Revenue [Line Items]
Total Timber Sales	0	0
Trading | Total Delivered
Disaggregation of Revenue [Line Items]
Total Timber Sales	31,838	39,083
Trading | Total Delivered | Domestic
Disaggregation of Revenue [Line Items]
Total Timber Sales	2,124	937
Trading | Total Delivered | Foreign
Disaggregation of Revenue [Line Items]
Total Timber Sales	$ 29,714	$ 38,146