Segment Information - Information by Business Segment (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segments
Revenues		$ 16,301	$ 23,676	$ 50,434	$ 19,865	$ 21,891	$ 33,988	$ 30,647	$ 13,512	$ 110,276	$ 100,038	$ 96,862
Cost of revenue										51,317	67,194	62,194
Other operating and corporate expenses										20,557	20,382	23,019
Depreciation, depletion and amortization										8,998	8,885	8,571
Investment income, net										12,150	35,410	17,776
Interest expense										(11,840)	(12,145)	(12,295)
Sale of vacation rental management, net											9,800
Consolidated income before income taxes										30,866	41,355	22,611
Capital expenditures										45,196	39,880	12,858
Total assets	$ 920,993	870,962				920,993				870,962	920,993
Interest income from investments in SPEs										8,197	8,201	8,202
Interest expense from Senior Notes issued by SPE										(8,788)	(8,777)	(8,833)
PCR Rentals Sale | Disposed of by Sale
Segments
Sale of vacation rental management, net	9,800
Consideration received from sale of assets	9,900					9,900					9,900
Hospitality | PCR Rentals Sale | Disposed of by Sale
Segments
Sale of vacation rental management, net											9,800
Consideration received from sale of assets	9,900					9,900					9,900
Operating Segments | Residential real estate
Segments
Revenues										42,869	21,747	19,483
Cost of revenue										9,775	12,455	6,383
Other operating and corporate expenses										4,695	4,297	5,744
Depreciation, depletion and amortization										167	187	286
Interest expense										(867)	(1,164)	(1,284)
Consolidated income before income taxes										27,084	3,903	5,887
Capital expenditures										15,865	8,407	3,319
Total assets	117,732	125,642				117,732				125,642	117,732
Operating Segments | Residential real estate | Mattamy - RiverTown sale | Real estate - Impact fees
Segments
Revenues										23,100
Operating Segments | Hospitality
Segments
Revenues										39,973	54,820	57,284
Cost of revenue										33,825	47,816	50,229
Other operating and corporate expenses										555	494	547
Depreciation, depletion and amortization										3,761	4,225	4,402
Sale of vacation rental management, net											9,800
Consolidated income before income taxes										1,652	12,444	2,087
Capital expenditures										7,400	4,918	1,287
Total assets	83,151	70,746				83,151				70,746	83,151
Operating Segments | Commercial leasing and sales
Segments
Revenues										16,485	14,510	11,929
Cost of revenue										6,397	5,979	4,431
Other operating and corporate expenses										3,183	3,444	3,492
Depreciation, depletion and amortization										4,411	3,729	3,137
Interest expense										(2,180)	(2,200)	(2,169)
Consolidated income before income taxes										(121)	(836)	(1,233)
Capital expenditures										20,483	25,248	6,836
Total assets	163,271	182,658				163,271				182,658	163,271
Operating Segments | Forestry
Segments
Revenues										8,135	8,443	7,791
Cost of revenue										1,097	903	1,121
Other operating and corporate expenses										384	396	530
Depreciation, depletion and amortization										514	575	552
Consolidated income before income taxes										6,222	6,586	5,609
Capital expenditures										1,069	1,100	1,095
Total assets	20,212	20,189				20,212				20,189	20,212
Operating Segments | Residential real estate and other
Segments
Investment income, net										320	89	97
Corporate and Other
Segments
Interest expense										(8,793)	(8,781)	(8,842)
Interest expense from Senior Notes issued by SPE										8,800	8,800	8,800
Corporate and Other | Mitigation bank credit
Segments
Revenues										2,200
Other
Segments
Revenues										2,814	518	375
Cost of revenue										223	41	30
Other operating and corporate expenses										11,740	11,751	12,706
Depreciation, depletion and amortization										145	169	194
Capital expenditures										379	207	321
Total assets	$ 536,627	$ 471,727				$ 536,627				471,727	536,627
Corporate
Segments
Investment income, net										11,830	35,321	17,679
Consolidated income before income taxes										(3,971)	19,258	10,261
Interest income from investments in SPEs										$ 8,200	$ 8,200	$ 8,200