Investment in Real Estate - Real Estate by Property Type and Segment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate Properties [Line Items]
Operating property	$ 205,957,000	$ 211,000,000
Development property	225,191,000	202,073,000
Investment property	5,116,000	5,124,000
Investment in unconsolidated affiliates	2,241,000	2,222,000
Total real estate investments	438,505,000	420,419,000
Less: Accumulated depreciation	53,496,000	49,772,000
Investment in real estate	385,009,000	370,647,000
Capitalized indirect costs incurred	700,000
Depreciation expense related to real estate investments	5,300,000	5,900,000	7,800,000
Depletion expense	1,200,000	1,600,000	4,400,000
Maximum
Real Estate Properties [Line Items]
Capitalized indirect costs incurred		100,000
Residential Real Estate
Real Estate Properties [Line Items]
Operating property	2,071,000	2,792,000
Development property	130,616,000	133,835,000
Commercial Real Estate
Real Estate Properties [Line Items]
Development property	57,959,000	59,851,000
Investment property	700,000	700,000
Resorts, leisure and leasing operations
Real Estate Properties [Line Items]
Operating property	146,624,000	152,906,000
Development property	28,482,000	351,000
Investment property	255,000	255,000
Forestry
Real Estate Properties [Line Items]
Operating property	57,078,000	54,984,000
Investment property	953,000	953,000
Rural land
Real Estate Properties [Line Items]
Operating property	139,000	139,000
Development property	5,768,000	5,768,000
Corporate
Real Estate Properties [Line Items]
Development property	2,366,000	2,268,000
Other
Real Estate Properties [Line Items]
Operating property	45,000	179,000
Investment property	$ 3,208,000	$ 3,216,000