QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended				12 Months Ended
	Jan. 31, 2017 USD ($) Property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2017 USD ($) Property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Quarterly Financial Information [Line Items]
Environmental remediation		$ 1,600	$ 2,700	$ 2,900		$ 1,576	$ 5,600	$ 0
Pretax profit (loss)						$ (9,795)	$ 7,741	25,581
Fund II
Quarterly Financial Information [Line Items]
Number of tree farms sold | Property	1				1
Proceeds from sale of tree farms	$ 26,500				$ 26,500
Productive Land | Fund II
Quarterly Financial Information [Line Items]
Pretax profit (loss)					$ 12,500			$ 12,500