Segment Information - Information by Business Segment (Details) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment										4
Revenues		$ 21,562	$ 33,654	$ 30,383	$ 13,197	$ 18,747	$ 27,192	$ 29,551	$ 20,254	$ 98,796	$ 95,744	$ 103,871
Cost of revenue										67,194	62,194	67,094
Other operating and corporate expenses										20,382	23,019	33,426
Depreciation, depletion and amortization										8,885	8,571	9,486
Investment Income, Net										35,410	17,776	22,688
Interest expense										(12,145)	(12,295)	(11,429)
Sale of vacation rental management, net										9,800	0	0
Income (loss) before income taxes										41,355	22,611	(1,163)
Expenditures for operating property										39,880	12,858	17,465
Assets	$ 920,993	920,993				1,027,945				920,993	1,027,945
Interest income										384	348	694
Disposed of by Sale | PCR Rentals Sale
Segment Reporting Information [Line Items]
Sale of vacation rental management, net	9,800
Consideration received from sale of assets	9,900	9,900								9,900
Resorts and leisure | Disposed of by Sale | PCR Rentals Sale
Segment Reporting Information [Line Items]
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
Segment Reporting Information [Line Items]
Revenues										21,747	19,483	21,137
Cost of revenue										12,455	6,383	10,853
Other operating and corporate expenses										4,297	5,744	10,215
Depreciation, depletion and amortization										187	286	544
Interest expense										(1,164)	(1,284)	(1,174)
Income (loss) before income taxes										3,903	5,887	(821)
Expenditures for operating property										8,407	3,319	4,923
Assets	117,732	117,732				112,220				117,732	112,220
Operating Segments | Resorts and leisure
Segment Reporting Information [Line Items]
Revenues										54,820	57,284	54,488
Cost of revenue										47,816	50,229	47,069
Other operating and corporate expenses										494	547	426
Depreciation, depletion and amortization										4,225	4,402	5,096
Sale of vacation rental management, net										9,800	0	0
Income (loss) before income taxes										12,444	2,087	1,819
Expenditures for operating property										4,918	1,287	2,526
Assets	83,151	83,151				73,436				83,151	73,436
Operating Segments | Commercial leasing and sales
Segment Reporting Information [Line Items]
Revenues										14,510	11,929	16,138
Cost of revenue										5,979	4,431	7,766
Other operating and corporate expenses										3,444	3,492	3,031
Depreciation, depletion and amortization										3,729	3,137	3,118
Interest expense										(2,200)	(2,169)	(1,489)
Income (loss) before income taxes										(836)	(1,233)	802
Expenditures for operating property										25,248	6,836	8,014
Assets	163,271	163,271				141,013				163,271	141,013
Operating Segments | Forestry revenue
Segment Reporting Information [Line Items]
Revenues										7,201	6,673	12,042
Cost of revenue										903	1,121	1,402
Other operating and corporate expenses										396	530	941
Depreciation, depletion and amortization										575	552	581
Income (loss) before income taxes										6,586	5,609	10,259
Expenditures for operating property										1,100	1,095	1,366
Assets	20,212	20,212				20,664				20,212	20,664
Operating Segments | Residential real estate and other
Segment Reporting Information [Line Items]
Investment Income, Net										89	97	571
Corporate/Other
Segment Reporting Information [Line Items]
Revenues										518	375	66
Cost of revenue										41	30	4
Other operating and corporate expenses										11,751	12,706	18,813
Depreciation, depletion and amortization										169	194	147
Investment Income, Net										35,321	17,679	22,117
Interest expense										(8,781)	(8,842)	(8,766)
Income (loss) before income taxes										19,258	10,261	(13,222)
Expenditures for operating property										207	321	636
Assets	$ 536,627	$ 536,627				$ 680,612				536,627	680,612
Corporate/Other | Special Purpose Entities
Segment Reporting Information [Line Items]
Interest expense										(8,800)	(8,800)	(8,800)
Interest income										$ 8,200	$ 8,200	$ 8,200