MERGER WITH POPE RESOURCES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	May 08, 2020 fund
Business Acquisition [Line Items]
Costs related to the merger with Pope Resources	$ 0	$ 2,487
Net (loss) income	15,032	26,421
Merger with Pope Resources
Business Acquisition [Line Items]
Number of timber funds acquired | fund			3
Costs related to the merger with Pope Resources		2,500
Increase in higher and better use timberlands from purchase price allocation	$ 8,200
Merger with Pope Resources | Acquisition-related Transaction Costs
Business Acquisition [Line Items]
Net (loss) income		$ 7,700