Investment in Real Estate - Real Estate by Property Type and Segment (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Real Estate Properties [Line Items]
Operating property	$ 213,556,000			$ 213,556,000			$ 211,000,000
Development property	215,299,000			215,299,000			202,073,000
Investment property	5,116,000			5,116,000			5,124,000
Investment in unconsolidated affiliates	2,183,000	[1]		2,183,000	[1]		2,222,000	[1]
Total real estate investments	436,154,000			436,154,000			420,419,000
Less: Accumulated depreciation	53,375,000			53,375,000			49,772,000
Investment in real estate	382,779,000			382,779,000			370,647,000
Capitalized indirect costs incurred	100,000			400,000
Asset impairment charges	0		0	0		0
Maximum
Real Estate Properties [Line Items]
Capitalized indirect costs incurred			100,000			100,000
Residential Real Estate
Real Estate Properties [Line Items]
Operating property	2,793,000			2,793,000			2,792,000
Development property	133,026,000			133,026,000			133,835,000
Commercial Real Estate
Real Estate Properties [Line Items]
Development property	58,014,000			58,014,000			59,851,000
Investment property	700,000			700,000			700,000
Resorts, leisure and leasing operations
Real Estate Properties [Line Items]
Operating property	154,361,000			154,361,000			152,906,000
Development property	16,178,000			16,178,000			351,000
Investment property	255,000			255,000			255,000
Forestry
Real Estate Properties [Line Items]
Operating property	56,218,000			56,218,000			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	2,314,000			2,314,000			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.