Higher and Better Use Timberlands and Real Estate Development Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Real Estate, Land and Land Development Costs [Roll Forward]
Non-current portion, beginning balance	$ 80,797
Plus: Current portion, beginning balance	18,350
Total Balance, beginning	99,147
Non-cash cost of land and improved development	(10,385)
Timber depletion from harvesting activities and basis of timber sold in real estate sales	(2,450)
Capitalized real estate development investments	9,501
Capital expenditures (silviculture)	254
Intersegment transfers	1,467
Other	6
Total Balance, ending	97,528
Less: Current portion, ending balance	(11,919)
Non-current portion, ending balance	85,609
Capitalized interest	600
Land and Timber
Real Estate, Land and Land Development Costs [Roll Forward]
Non-current portion, beginning balance	59,653
Plus: Current portion, beginning balance	6,702
Total Balance, beginning	66,355
Non-cash cost of land and improved development	(2,193)
Timber depletion from harvesting activities and basis of timber sold in real estate sales	(2,450)
Capitalized real estate development investments	0
Capital expenditures (silviculture)	254
Intersegment transfers	1,467
Other	5
Total Balance, ending	63,428
Less: Current portion, ending balance	(4,239)
Non-current portion, ending balance	59,189
Development Investments
Real Estate, Land and Land Development Costs [Roll Forward]
Non-current portion, beginning balance	21,144
Plus: Current portion, beginning balance	11,648
Total Balance, beginning	32,792
Non-cash cost of land and improved development	(8,192)
Timber depletion from harvesting activities and basis of timber sold in real estate sales	0
Capitalized real estate development investments	9,501
Capital expenditures (silviculture)	0
Intersegment transfers	0
Other	1
Total Balance, ending	34,100
Less: Current portion, ending balance	(7,680)
Non-current portion, ending balance	$ 26,420