ORM TIMBER FUND II, INC. (FUND II), ORM TIMBER FUND III (REIT) INC. (FUND III), AND ORM TIMBER FUND IV (REIT) LLC. (FUND IV) (COLLECTIVELY, “THE FUNDS”) (Narrative) (Details) $ in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	Jan. 31, 2019 USD ($) a	Jan. 31, 2018 USD ($) Property	Jan. 31, 2017 USD ($) Property	Mar. 31, 2017 USD ($) Property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 31, 2018 USD ($)
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Pretax profit (loss)					$ (9,795)	$ 7,741	$ 25,581
Deposit for acquisitions					0	1,005	5,688
Management fees payable					$ 1,100	1,000
South Puget Sound WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price								$ 4,800
South Central WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price	$ 20,300
Timber and Roads | South Central WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price	17,500
Land | South Central WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price	2,800
Fund II and Fund III
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating term for Fund					10 years
Fund II
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of tree farms sold | Property			1	1
Proceeds from sale of tree farms			$ 26,500	$ 26,500
Fund II | Productive Land
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Pretax profit (loss)				$ 12,500			$ 12,500
Fund IV
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Operating term for Fund					15 years
Total purchase price		$ 17,100
Deposit for acquisitions						$ 1,000
Fund IV | Southwestern Oregon and South Puget Sound Washington
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of acquisitions | Property		2
Fund IV | Southwestern OR
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of acquisitions | Property		1
Total purchase price		$ 33,600
Fund IV | South Puget Sound WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of acquisitions | Property		1
Total purchase price		$ 80,400						32,300
Fund IV | South Central WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price	$ 3,000
Land acquired (in acres) | a	7,100
Fund IV | Timber and Roads
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price		100,700
Fund IV | Timber and Roads | South Puget Sound WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price								27,100
Fund IV | Land
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price		$ 13,300
Fund IV | Land | South Puget Sound WA
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total purchase price								$ 5,200
Fund IV | Pope Resources And Olympic Resource Management LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest					15.00%
Fund III | Pope Resources And Olympic Resource Management LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest					5.00%
Fund II | Pope Resources And Olympic Resource Management LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest					20.00%