Revenue from Contract with Customer (Log Sale and Other Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 25,042	$ 24,987
Partnership Timber
Disaggregation of Revenue [Line Items]
Revenue	15,171	15,138
Funds Timber
Disaggregation of Revenue [Line Items]
Revenue	9,440	9,541
Log sale revenue \| Partnership Timber
Disaggregation of Revenue [Line Items]
Revenue	14,722	14,635
Log sale revenue \| Funds Timber
Disaggregation of Revenue [Line Items]
Revenue	8,860	9,509
Other revenue \| Partnership Timber
Disaggregation of Revenue [Line Items]
Revenue	449	503
Other revenue \| Funds Timber
Disaggregation of Revenue [Line Items]
Revenue	$ 580	$ 32

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration