TIMBERLAND ACQUISITIONS - Summary of Timberland Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) a	Dec. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Cost | $	$ 24,695	$ 142,287	$ 57,608
Acres | a	15,012	70,919
Alabama
Business Acquisition [Line Items]
Cost | $	$ 100	$ 0
Acres | a	56	0
Florida
Business Acquisition [Line Items]
Cost | $	$ 0	$ 71,183
Acres | a	0	42,522
Georgia
Business Acquisition [Line Items]
Cost | $	$ 18	$ 13,395
Acres | a	20	10,271
Louisiana
Business Acquisition [Line Items]
Cost | $	$ 24,123	$ 0
Acres | a	12,558	0
Texas
Business Acquisition [Line Items]
Cost | $	$ 0	$ 14,349
Acres | a	0	6,643
Washington
Business Acquisition [Line Items]
Cost | $	$ 0	$ 7,340
Acres | a	0	2,260
New Zealand
Business Acquisition [Line Items]
Cost | $	$ 454	$ 36,020
Acres | a	2,378	9,223