SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) a Partner $ / shares shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) a fund Partner Residential_Lot Segment $ / shares shares	Dec. 31, 2017 USD ($) parcel_of_land shares	Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items]
Number of private equity timber funds | fund									3
Number of business segments | Segment									4
Conservation easement sales	$ 22,647,000	$ 28,008,000	$ 27,912,000	$ 24,987,000	$ 47,784,000	$ 18,803,000	$ 15,891,000	$ 17,345,000
Number of general partners | Partner	2								2
Number of partnership units owned by general partners (in shares) | shares	60,000				60,000				60,000	60,000
Other assets	$ 9,255,000				$ 15,308,000				$ 9,255,000	$ 15,308,000
Allowance for doubtful accounts on accounts receivable	0				1,000				0	1,000
Deferred tax assets, valuation allowance	0								0
Interest expense and penalties on taxes									$ 0	$ 0	$ 0
Number of residential lots held-for-sale | Residential_Lot									65
Number of parcels of land held-for-sale | parcel_of_land										3
Land and timber held for sale	5,697,000				5,728,000				$ 5,697,000	$ 5,728,000
Deferred revenue	336,000				197,000				$ 336,000	197,000
Restricted Units
Significant Accounting Policies [Line Items]
Vesting period of restricted stock unit award									4 years
Land
Significant Accounting Policies [Line Items]
Land held for sale	$ 5,700,000								$ 5,700,000
Area of land for sale (in acres) | a	19								19
Like-Kind Intermediaries
Significant Accounting Policies [Line Items]
Other assets	$ 0				$ 598,000				$ 0	$ 598,000
General Partners
Significant Accounting Policies [Line Items]
Number of partnership units owned by general partners (in shares) | shares	60,000								60,000
Fund III
Significant Accounting Policies [Line Items]
Percentage of interests owned by third parties in non controlling interests	95.00%								95.00%
Fund II
Significant Accounting Policies [Line Items]
Percentage of interests owned by third parties in non controlling interests	80.00%								80.00%
Ferncliff Investors
Significant Accounting Policies [Line Items]
Percentage of interests owned by third parties in non controlling interests	66.67%								66.67%
Fund IV
Significant Accounting Policies [Line Items]
Percentage of interests owned by third parties in non controlling interests	85.00%								85.00%
Fund II and Fund III | Series A Preferred Stock
Significant Accounting Policies [Line Items]
Preferred stock issued (in shares) | shares	125								125
Preferred stock issued at par value (in dollars per share) | $ / shares	$ 0.01								$ 0.01
Preferred stock rate of interest									12.50%
Series A preferred stock (in dollars per share) | $ / shares	1,000								$ 1,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares	$ 1,000								$ 1,000
Maximum amount required to pay on redemption upon settlement	$ 125,000								$ 125,000
Topic 606 | Difference due to Topic 606 | Timber deed sale revenue
Significant Accounting Policies [Line Items]
Conservation easement sales									$ 7,400,000
ORM Timber Funds | Olympic Resource Management Llc
Significant Accounting Policies [Line Items]
Ownership interest									1.00%
Fund II | Partnership Timber
Significant Accounting Policies [Line Items]
Ownership interest									19.00%
Fund III | Partnership Timber
Significant Accounting Policies [Line Items]
Ownership interest									4.00%
Fund IV | Partnership Timber
Significant Accounting Policies [Line Items]
Ownership interest									14.00%
Ferncliff Investors | Ferncliff Management
Significant Accounting Policies [Line Items]
Ownership interest									33.33%
Bainbridge Landing | Ferncliff Investors
Significant Accounting Policies [Line Items]
Percentage of ownership interest in Funds	50.00%								50.00%