Revenue Recognition - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of revenue
Leasing revenue	$ 4,963	$ 4,037	$ 14,169	$ 11,218
Total revenue	42,041	32,856	96,695	84,426
Recognized at a point in time
Disaggregation of revenue
Revenue	36,112	28,040	80,190	71,137
Recognized over time
Disaggregation of revenue
Revenue	966	779	2,336	2,071
Real estate
Disaggregation of revenue
Revenue	18,476	13,490	41,838	33,634
Hospitality
Disaggregation of revenue
Revenue	17,005	14,003	35,180	36,994
Timber
Disaggregation of revenue
Revenue	1,597	1,326	5,508	2,580
Operating Segments | Residential
Disaggregation of revenue
Leasing revenue	17	11	94	33
Total revenue	16,353	11,101	33,518	28,644
Operating Segments | Residential | Recognized at a point in time
Disaggregation of revenue
Revenue	16,336	11,090	33,424	28,611
Operating Segments | Residential | Real estate
Disaggregation of revenue
Revenue	16,104	10,963	33,060	28,150
Operating Segments | Residential | Hospitality
Disaggregation of revenue
Revenue	232	127	364	461
Operating Segments | Hospitality
Disaggregation of revenue
Leasing revenue	3	28	8	79
Total revenue	16,776	13,904	34,824	36,612
Operating Segments | Hospitality | Recognized at a point in time
Disaggregation of revenue
Revenue	15,807	13,097	32,480	34,462
Operating Segments | Hospitality | Recognized over time
Disaggregation of revenue
Revenue	966	779	2,336	2,071
Operating Segments | Hospitality | Hospitality
Disaggregation of revenue
Revenue	16,773	13,876	34,816	36,533
Operating Segments | Commercial
Disaggregation of revenue
Leasing revenue	4,943	3,998	14,067	11,106
Total revenue	8,697	7,516	26,819	18,277
Operating Segments | Commercial | Recognized at a point in time
Disaggregation of revenue
Revenue	3,754	3,518	12,752	7,171
Operating Segments | Commercial | Real estate
Disaggregation of revenue
Revenue	2,157	2,192	7,244	4,591
Operating Segments | Commercial | Timber
Disaggregation of revenue
Revenue	1,597	1,326	5,508	2,580
Other
Disaggregation of revenue
Total revenue	215	335	1,534	893
Other | Recognized at a point in time
Disaggregation of revenue
Revenue	215	335	1,534	893
Other | Real estate
Disaggregation of revenue
Revenue	$ 215	$ 335	$ 1,534	$ 893