Investment in Real Estate - Real Estate by Property Type and Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Real Estate Properties [Line Items]
Development property	$ 160,856,000		$ 161,252,000
Operating property	216,471,000		216,416,000
Less: Accumulated depreciation	65,589,000		64,069,000
Total operating property, net	150,882,000		152,347,000
Investment in real estate, net	311,738,000		313,599,000
Capitalized indirect costs incurred (less than for the three months ended March 31, 2015)	0	$ 100,000
Residential real estate
Real Estate Properties [Line Items]
Development property	98,766,000		99,413,000
Operating property	8,091,000		8,091,000
Commercial real estate
Real Estate Properties [Line Items]
Development property	56,652,000		56,587,000
Resorts and leisure
Real Estate Properties [Line Items]
Operating property	109,525,000		109,425,000
Leasing operations
Real Estate Properties [Line Items]
Development property	528,000		360,000
Operating property	79,571,000		79,550,000
Forestry
Real Estate Properties [Line Items]
Development property	2,639,000		2,681,000
Operating property	19,234,000		19,300,000
Other
Real Estate Properties [Line Items]
Operating property	50,000		50,000
Corporate
Real Estate Properties [Line Items]
Development property	$ 2,271,000		$ 2,211,000