Segment Information - Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segments
Revenues	$ 50,434	$ 30,647	$ 70,298	$ 44,160
Income (loss) before income taxes	32,614	16,523	32,990	22,990
Total assets	883,768		883,768		$ 920,993
Operating Segments | Residential real estate
Segments
Revenues	28,755	4,706	35,790	5,980
Income (loss) before income taxes	24,957	1,893	26,417	1,224
Total assets	120,502		120,502		117,732
Operating Segments | Resorts and leisure
Segments
Revenues	13,270	19,328	20,719	27,436
Income (loss) before income taxes	2,403	3,380	1,868	1,604
Total assets	77,610		77,610		83,151
Operating Segments | Commercial leasing and sales
Segments
Revenues	3,345	4,831	6,495	7,795
Income (loss) before income taxes	(190)	235	(280)	(138)
Total assets	172,494		172,494		163,271
Operating Segments | Forestry
Segments
Revenues	2,808	1,588	4,788	2,674
Income (loss) before income taxes	2,226	1,130	3,757	2,371
Total assets	20,228		20,228		20,212
Corporate/Other
Segments
Revenues	2,256	194	2,506	275
Income (loss) before income taxes	3,218	$ 9,885	1,228	$ 17,929
Total assets	$ 492,934		$ 492,934		$ 536,627