Investment in Real Estate - Real Estate by Property Type and Segment (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Real Estate Properties [Line Items]
Operating property	$ 211,889,000			$ 211,889,000			$ 211,000,000
Development property	212,791,000			212,791,000			202,073,000
Investment property	5,116,000			5,116,000			5,124,000
Investment in unconsolidated affiliates	2,195,000	[1]		2,195,000	[1]		2,222,000	[1],[2]
Total real estate investments	431,991,000			431,991,000			420,419,000
Less: Accumulated depreciation	52,236,000			52,236,000			49,772,000
Investment in real estate	379,755,000			379,755,000			370,647,000
Capitalized indirect costs incurred	100,000		100,000	100,000		100,000
Asset impairment charges	0		0	0		0
Residential Real Estate
Real Estate Properties [Line Items]
Operating property	2,786,000			2,786,000			2,792,000
Development property	135,991,000			135,991,000			133,835,000
Commercial Real Estate
Real Estate Properties [Line Items]
Development property	57,977,000			57,977,000			59,851,000
Investment property	700,000			700,000			700,000
Resorts, leisure and leasing operations
Real Estate Properties [Line Items]
Operating property	153,162,000			153,162,000			152,906,000
Development property	10,781,000			10,781,000			351,000
Investment property	255,000			255,000			255,000
Forestry
Real Estate Properties [Line Items]
Operating property	55,757,000			55,757,000			54,984,000
Investment property	953,000			953,000			953,000
Rural land
Real Estate Properties [Line Items]
Operating property	139,000			139,000			139,000
Development property	5,767,000			5,767,000			5,768,000
Corporate
Real Estate Properties [Line Items]
Development property	2,275,000			2,275,000			2,268,000
Other
Real Estate Properties [Line Items]
Operating property	45,000			45,000			179,000
Investment property	$ 3,208,000			$ 3,208,000			$ 3,216,000

[1] Recorded in the Company’s resorts, leisure and leasing operations' segment.

[2]